Embryology of the head and neck

2013 ◽  
Author(s):  
Martin E. Atkinson
Keyword(s):  
Head And Neck ◽  
Neural Tube ◽  
Neck Region ◽  
Branchial Arch ◽  
Paraxial Mesoderm ◽  
Pharyngeal Arches ◽  
Branchial Arches ◽  
Aquatic Vertebrates ◽  
History Of ◽  
Further Development

Embryology and development have been covered after the main anatomical descriptions in the previous sections, but it is going to precede them in this section. The reason for this departure is that the embryonic development of the head and neck explains much of the mature anatomy which can seem illogical without its developmental history. The development of the head, face, and neck is an area of embryology where significant strides in our understanding have been made in the last few years. The development of the head is intimately related to the development of the brain outlined in Chapter 19 and its effects on shaping the head will be described in Chapters 32 and 33. The major thrust of this chapter is the description of the formation of structures called the pharyngeal (or branchial) arches and the fate of the tissues that contribute to them. All four embryonic germ layers contribute to the pharyngeal arches and their derivatives, hence to further development of the head and neck. Figure 21.1 is a cross section through the neck region of a 3-week old embryo after neurulation and folding described in Chapter 8. It shows the structures and tissues that contribute to the formation of the head and neck: • The neural tube situated posteriorly and the ectomesenchymal neural crest cells that arise as the tube closes; • The paraxial mesoderm anterolateral to the neural tube; • The endodermal foregut tube anteriorly; • The investing layer of ectoderm. The development of all these tissues is intimately interrelated. The pharyngeal arches are very ancient structures in the evolutionary history of vertebrates. The arches and their individual components have undergone many modifications during their long history. In ancestral aquatic vertebrates, as in modern fishes, water was drawn in through the mouth and expelled through a series of gill slits (or branchiae, hence the term ‘branchial arch’) in the sides of the pharynx. Oxygen was extracted as the water was passed over a gill apparatus supported by a branchial arch skeleton moved by branchial muscles controlled by branchial nerves. Although ventilation and respiration is now a function of the lungs in land vertebrates, the pharyngeal arches persist during vertebrate development.

scholarly journals A distinct developmental programme for the cranial paraxial mesoderm in the chick embryo

Development ◽  
1998 ◽  
Vol 125 (17) ◽  
pp. 3461-3472 ◽  
Author(s):  
A. Hacker ◽  
S. Guthrie
Keyword(s):  
Neural Tube ◽  
Branchial Arch ◽  
Paraxial Mesoderm ◽  
Developmental Pathways ◽  
Myogenic Cells ◽  
Branchial Arches ◽  
Developmental Programme ◽  
Myogenic Markers ◽  
Somitic Mesoderm ◽  
Late Stages

Cells of the cranial paraxial mesoderm give rise to parts of the skull and muscles of the head. Some mesoderm cells migrate from locations close to the hindbrain into the branchial arches where they undergo muscle differentiation. We have characterised these migratory pathways in chick embryos either by DiI-labelling cells before migration or by grafting quail cranial paraxial mesoderm orthotopically. These experiments demonstrate that depending on their initial rostrocaudal position, cranial paraxial mesoderm cells migrate to fill the core of specific branchial arches. A survey of the expression of myogenic genes showed that the myogenic markers Myf5, MyoD and myogenin were expressed in branchial arch muscle, but at comparatively late stages compared with their expression in the somites. Pax3 was not expressed by myogenic cells that migrate into the branchial arches despite its expression in migrating precursors of limb muscles. In order to test whether segmental plate or somitic mesoderm has the ability to migrate in a cranial location, we grafted quail trunk mesoderm into the cranial paraxial mesoderm region. While segmental plate mesoderm cells did not migrate into the branchial arches, somitic cells were capable of migrating and were incorporated into the branchial arch muscle mass. Grafted somitic cells in the vicinity of the neural tube maintained expression of the somitic markers Pax3, MyoD and Pax1. By contrast, ectopic somitic cells located distal to the neural tube and in the branchial arches did not express Pax3. These data imply that signals in the vicinity of the hindbrain and branchial arches act on migrating myogenic cells to influence their gene expression and developmental pathways.

scholarly journals Leiomyosarcoma of the Tracheostomy Site in a Patient with History of Laryngeal Squamous Cell Carcinoma

2021 ◽  
pp. 912-917
Author(s):  
Zainub Ajmal ◽  
Abdul Moiz Khan ◽  
Lezah McCarthy ◽  
Allison Lupinetti ◽  
Syed Mehdi
Keyword(s):  
Risk Factors ◽  
Squamous Cell Carcinoma ◽  
Cell Carcinoma ◽  
Head And Neck ◽  
Squamous Cell ◽  
English Literature ◽  
Neck Region ◽  
Multiple Risk Factors ◽  
History Of ◽  
Rare Malignancy

Leiomyosarcoma (LMS) of the trachea is an extremely rare malignancy with only a few reported cases in English literature. As such the diagnosis can be frequently missed or delayed. We present a case of a 69-year-old male who underwent tracheostomy for airway obstruction secondary to glottic squamous cell carcinoma and treated definitely with radiation therapy. Subsequently, the patient developed LMS of the tracheostomy site. The case further details multiple risk factors that could contribute to development of LMS including radiation exposure, prior malignancy, and chronic inflammation. These risk factors have been well established for LMS in other sites but less so in the head and neck region, which is the subject of our discussion. We also review the current guidelines for head and neck as well as limb sarcomas and discussed role of surgery or radiation and their accompanying challenges in management of this rare malignancy.

Jaw and branchial arch mutants in zebrafish I: branchial arches

Development ◽  
1996 ◽  
Vol 123 (1) ◽  
pp. 329-344 ◽  
Author(s):  
T.F. Schilling ◽  
T. Piotrowski ◽  
H. Grandel ◽  
M. Brand ◽  
C.P. Heisenberg ◽  
...  
Keyword(s):  
Neural Crest ◽  
Zebrafish Embryo ◽  
Neural Crest Cells ◽  
Branchial Arch ◽  
Pigment Cells ◽  
Pharyngeal Arches ◽  
Pectoral Fins ◽  
Branchial Arches ◽  
Group Members ◽  
The Brain

Jaws and branchial arches together are a basic, segmented feature of the vertebrate head. Seven arches develop in the zebrafish embryo (Danio rerio), derived largely from neural crest cells that form the cartilaginous skeleton. In this and the following paper we describe the phenotypes of 109 arch mutants, focusing here on three classes that affect the posterior pharyngeal arches, including the hyoid and five gill-bearing arches. In lockjaw, the hyoid arch is strongly reduced and subsets of branchial arches do not develop. Mutants of a large second class, designated the flathead group, lack several adjacent branchial arches and their associated cartilages. Five alleles at the flathead locus all lead to larvae that lack arches 4–6. Among 34 other flathead group members complementation tests are incomplete, but at least six unique phenotypes can be distinguished. These all delete continuous stretches of adjacent branchial arches and unpaired cartilages in the ventral midline. Many show cell death in the midbrain, from which some neural crest precursors of the arches originate. lockjaw and a few mutants in the flathead group, including pistachio, affect both jaw cartilage and pigmentation, reflecting essential functions of these genes in at least two neural crest lineages. Mutants of a third class, including boxer, dackel and pincher, affect pectoral fins and axonal trajectories in the brain, as well as the arches. Their skeletal phenotypes suggest that they disrupt cartilage morphogenesis in all arches. Our results suggest that there are sets of genes that: (1) specify neural crest cells in groups of adjacent head segments, and (2) function in common genetic pathways in a variety of tissues including the brain, pectoral fins and pigment cells as well as pharyngeal arches.

Myeloid Sarcoma of the Head and Neck Region

2013 ◽  
Vol 137 (11) ◽  
pp. 1560-1568 ◽  
Author(s):  
Jane Zhou ◽  
Diana Bell ◽  
L. Jeffrey Medeiros
Keyword(s):  
Head And Neck ◽  
Low Frequency ◽  
Neck Region ◽  
Immunohistochemical Analysis ◽  
Myeloid Sarcoma ◽  
Head And Neck Region ◽  
Bone Marrow Disease ◽  
Highly Sensitive ◽  
History Of ◽  
High Degree

Context.—Myeloid sarcoma of the head and neck region can pose diagnostic challenges because of the low frequency of myeloid sarcoma and the potential for tumors of almost any lineage to occur in the head and neck. Objective.—To study the clinicopathologic and immunohistochemical characteristics of myeloid sarcoma in the head and neck region and to review the differential diagnosis. Design.—We searched for cases of myeloid sarcoma involving the head and neck region for a 24-year period at our institution. The medical records and pathology slides were reviewed. Additional immunohistochemical stains were performed. Results.—We identified 17 patients, age 17 to 85 years. Most tumors involved the oral cavity. Myeloid sarcoma was the initial diagnosis in 9 patients (53%); the remaining 8 patients (47%) had a history of bone marrow disease. Immunohistochemical analysis using antibodies specific for lysozyme, CD43, and CD68 were highly sensitive for diagnosis but were not specific. By contrast, assessment for myeloperoxidase in this study was less sensitive but more specific. We also used antibodies specific for CD11c and CD33 in a subset of cases, and these reagents seem helpful as well. Conclusions.—The clinical presentation of myeloid sarcoma involving the head and neck, particularly the mouth, is often nonspecific, and a high degree of suspicion for the possibility of myeloid sarcoma is needed. Immunohistochemistry is very helpful for establishing the diagnosis.

TMJ pain as a presentation of metastatic breast cancer to the right mandibular condyle

2021 ◽  
Vol 14 (3) ◽  
pp. e241601
Author(s):  
Victor Ken On Chang ◽  
Samuel Thambar
Keyword(s):  
Breast Cancer ◽  
Metastatic Breast Cancer ◽  
Head And Neck ◽  
Cancer Metastasis ◽  
Mandibular Condyle ◽  
Metastatic Breast ◽  
Neck Region ◽  
Head And Neck Region ◽  
History Of ◽  
The Right

Cancer metastasis to the oral and maxillofacial region is uncommon, and metastasis to the mandibular condyle is considered rare. We present a case of a 56-year-old woman with a history of invasive ductal cell carcinoma of the right breast, 10 years in remission, presenting with a 6-month history of symptoms typical of temporomandibular joint (TMJ) dysfunction. Imaging revealed an osteolytic lesion of her right TMJ and subsequent open biopsy confirmed the diagnosis of metastatic breast cancer. Despite the rarity of metastatic cancer to the head and neck region, it is still important for clinicians from both medical and dental backgrounds to consider this differential diagnosis, particularly in patients with a history of hormonal positive subtype of breast cancer. Given that bony metastasis can manifest even 10 years after initial diagnosis, surveillance which includes examination of the head and neck region is important, and may include routine plain-film imaging surveillance with an orthopantomogram (OPG).

scholarly journals Pilomatrixoma of the head and neck: Typical presentation of a rare lesion

Ultrasound ◽  
2019 ◽  
Vol 28 (1) ◽  
pp. 51-53
Author(s):  
Mert Sirakaya ◽  
Sanjay Vydianath
Keyword(s):  
Head And Neck ◽  
Neck Region ◽  
Hair Follicles ◽  
Branchial Cleft Cyst ◽  
Head And Neck Region ◽  
History Of ◽  
Rare Lesion ◽  
Branchial Cleft ◽  
Clinical Differential Diagnosis ◽  
Benign Tumours

Pilomatrixomas are benign tumours of primitive hair follicles, usually presenting as painless lumps in the head and neck region in children. As they are uncommon, they are often misdiagnosed clinically. We discuss a case of a five-year-old boy presenting with a five-month history of a pre-auricular lump. The initial clinical differential diagnosis was of a dermoid or a branchial cleft cyst. However, on ultrasonography the lesion was typical of a pilomatrixoma. The imaging literature is reviewed to illustrate the sonographic appearances of pilomatrixomas.

scholarly journals Grisel’s Syndrome: A Rare Complication following Adenotonsillectomy

2014 ◽  
Vol 2014 ◽  
pp. 1-4 ◽  
Author(s):  
Abdulkadir Bucak ◽  
Sahin Ulu ◽  
Abdullah Aycicek ◽  
Emre Kacar ◽  
Murat Cem Miman
Keyword(s):  
Head And Neck ◽  
Imaging Techniques ◽  
Rare Complication ◽  
Neck Region ◽  
Neck Surgery ◽  
Upper Respiratory Tract ◽  
Head And Neck Region ◽  
Grisel’S Syndrome ◽  
History Of ◽  
Or History

Grisel’s syndrome is a nontraumatic atlantoaxial subluxation which is usually secondary of an infection or an inflammation at the head and neck region. It can be observed after surgery of head and neck region. Etiopathogenesis has not been clearly described yet, but increased looseness of paraspinal ligament is thought to be responsible. Patients typically present with painful torticollis. Diagnosis of Grisel’s syndrome is largely based on suspicion of the patient who has recently underwent surgery or history of infection in head and neck region. Physical examination and imaging techniques assist in diagnosis. Therefore, clinicians should be aware of acute nontraumatic torticollis after recently applied the head and neck surgery or undergone upper respiratory tract infection. In this paper, a case of an eight-year-old male patient who had Grisel’s syndrome after adenotonsillectomy is discussed with review of the literature.

scholarly journals Diagnostic dilemmas of head and neck tuberculosis: our experience and review of literature

2020 ◽  
Vol 6 (5) ◽  
pp. 934
Author(s):  
Pallavi Pavithran ◽  
Mahesh S. G.
Keyword(s):  
Head And Neck ◽  
Extrapulmonary Tuberculosis ◽  
Cervical Lymphadenopathy ◽  
Neck Region ◽  
Review Of Literature ◽  
Nodal Disease ◽  
Head And Neck Region ◽  
History Of ◽  
Tuberculous Otitis Media ◽  
High Index Of Suspicion

<p class="abstract"><strong>Background:</strong> The aim of the study was to highlight the varied and changing presentations of head and neck tuberculosis, discuss the difficulties in diagnosis and treatment.</p><p class="abstract"><strong>Methods:</strong> This was a 5 years retrospective analysis of patients with extrapulmonary tuberculosis (EPTB) of the head and neck region.  </p><p class="abstract"><strong>Results:</strong> 43 patients with EPTB were studied. Most had cervical lymphadenopathy (35), 9 had laryngeal, 7 tuberculous otitis media, and one patient each of PNS, oropharyngeal and retropharyngeal involvement. 8 patients had pulmonary TB, 2 had Potts spine, and 5 gave history of previous TB. FNAC was effective in nodal disease, PPD test positive in 20% and HPE was used to make the diagnosis in other types.</p><p class="abstract"><strong>Conclusions:</strong> TB is re-emerging as a significant cause of morbidity. Diagnosing EPTB requires high index of suspicion. Cervical lymphadenopathy is the commonest presentation, followed by larynx, and then ear. FNAC is a reliable and convenient way to diagnose lymphadenopathy. Hitopathological examination needed for confirmation, and for other sites. Further investigations are needed to exclude pulmonary or systemic TB. All patients should be categorised into proper category of anti-tuberculous treatment (ATT) and treated according to ATT regimen.</p>

scholarly journals Frequency of Involvement of Different Head and Neck Sites in Referred Otalgia

2021 ◽  
pp. 137-142
Author(s):  
Ashfaq Hussain ◽  
Salman Baig ◽  
Mohammad Farooq Bhutta ◽  
Nasima Iqbal ◽  
Ali Nawaz Bijarani ◽  
...  
Keyword(s):  
Head And Neck ◽  
Neck Region ◽  
Unknown Origin ◽  
Sensory Innervation ◽  
Hypopharyngeal Carcinoma ◽  
P Value ◽  
Cross Sectional ◽  
Radio Imaging ◽  
History Of ◽  
Study Participants

Aim: To find out the most frequent head and neck sites of origin of referred otalgia. Study Design: Descriptive cross-sectional. Place and Duration of Study: Study was conducted at the ENT department of Bahawal Victoria hospital Bahawalpur during January 2019 to December 2019. Methodology: About 500 patients with ear ache were examined and after exclusion 150 were finally analyzed. Detailed history of the patient and clinical examination were done along with radio imaging and endoscopic studies wherever needed. Diagnosis of referred otalgia was made after having normal ear examination along with pathology lying at different head and neck region which share common sensory innervation. For analysis SPSS version-20 was used. Results: The mean age of the study participants was 28.23 ±13 years. The majority of participants were having otalgia of tonsillar origin followed by dental origin and pharyngitis with 31.3%, 23.3% and 16% respectively. Very few of them having otalgia originating from hypopharyngeal carcinoma and laryngeal carcinoma i.e. 3.3% and 2% respectively. While only 4.7% of otalgia were of unknown origin. Female participants were having higher frequency of otalgia which is originated from diseases of temporomandibular joint, hypopharyngeal carcinoma and otalgia of unknown origin in comparison to male participants but differences were insignificant. Otalgia originated from tonsillar and dental causes and due to pharyngitis were most common among the younger age group but having non-significant p-value. Conclusion: It has been concluded that the patients presenting with ear pain, have sometimes no underlying ear pathology. If the ear examination is normal then it is important to examine all other sites of head and neck which share sensory innervation with the ear including teeth, tonsils, pharynx, larynx, nose and paranasal sinuses to find out the exact cause of referred otalgia.

scholarly journals Castleman Disease of the Parotid Gland: A Report of a Case

2015 ◽  
Vol 2015 ◽  
pp. 1-3 ◽  
Author(s):  
Fawaz Abo-Alhassan ◽  
Fatemah Faras ◽  
Jassem Bastaki ◽  
Mutlaq K. Al-Sihan
Keyword(s):  
Parotid Gland ◽  
Head And Neck ◽  
Lymphoproliferative Disorder ◽  
Neck Region ◽  
Excisional Biopsy ◽  
Castleman Disease ◽  
Unknown Etiology ◽  
Common Site ◽  
Head And Neck Region ◽  
History Of

Castleman disease is an extremely rare benign lymphoproliferative disorder of unknown etiology. It affects the lymphatic chain in anybody region, although the commonest site is the mediastinum. The head and neck region is the second most common site; however, the salivary glands are rarely affected. We report a case of a 29-year-old Asian lady who presented with a 2-year history of an enlarging left parotid mass. Histopathology of the excisional biopsy confirmed the diagnosis of Castleman disease.

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