Flashcards in Head and Neck Deck (13)
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1
Q
Tongue
A
- 4th week
- 2 lateral + 2 medial swellings(tuberculum impar + copula)
- 3rd medial swelling ⇒ epiglottis
- after 3rd ⇒ laryngeal orifice between 2 arytenoid swellings
- lateral swellings + tuberculum impar ⇒ anterior 2/3 of tomgue
- hypobrachial eminence ⇒ posterior 1/3 of tongue
- occipital somites ⇒ muscles of tongue
2
Q
Thyroid gland
A
- appear as epithelial proliferation in floor of pharynx between tubercular impart + hypo brachial eminence ⇒ foramen cecum
- descends in front of pharyngeal gut
- thyroglossal duct: canal that keeps gland + tongue in contact, disappears later
- in 7th week ⇒ in front of trachea
3
Q
Face
A
- stomodeum⇒ precursor of mouth
- nasal pits ⇒ invagination of nasal placodes
- upper lip ⇒ maxillary + medial nasal prominence
- lower lip ⇒ 2 mandibular prominence
- jaw ⇒ 2 mandibular prominence
- nasolacrimal duct ⇒ nasolacrimal groove between maxillary and lateral nasal prominence
- cheeks ⇒ maxillary prominence
- maxillae ⇒ maxillary prominence
- nose ⇒ frontal + medial nasal + lateral nasal prominence
- piltrum of upper lip ⇒ 2 medial nasal prominence
- incisor teeth ⇒ 2 medial nasal prominence
- primary palate ⇒ 2 medial nasal prominence
- palatine shelves ⇒ maxillary prominence
- secondary palate ⇒ fused shelves
- incisive foramen ⇒ point between primary + secondary palates
4
Q
Nasal cavity
A
- week 6
- nasal pits deepen ⇒ nasal sac
- oronasal membrane ⇒ separates nasal sac + primitive oral cavity ⇒ membrane ruptures ⇒ primitive choanae
- swelling in lateral wall of each cavity ⇒ superior, middle + inferior nasal conchae
5
Q
1st Pharyngeal arch
A
NERVE: - trigeminal nerve (V/3) MUSCLES: - muscles of mastication - mylohyoid - anterior belly of digastric - tensor veli palatine - tensor tympani SKELETON: - premaxilla - maxilla - zygomatic bone - temporal bone - Meckel's cartilage - mandible - malleus - incus - anterior ligament of malleus - sphenomandibular ligament
6
Q
2nd Pharyngeal arch
A
NERVE: - facial nerve MUSCLES: - mimetic muscles - posterior belly of digastric - stylohyoid - stapedius SKELETON: - stapes - styloid process - stylohyoid ligament - lesser horn + body of hyoid
7
Q
3rd Pharyngeal arch
A
NERVE: - glossopharyngeal nerve MUSCLES: stylopharyngeus SKELETON: - greater horn + body of hyoid bone
8
Q
4th-6th Pharyngeal arch
A
NERVE: - superior laryngeal nerve - recurrent laryngeal nerve MUSCLES: - cricothyroid - muscles of pharynx - muscles of soft palate - intrinsic laryngeal muscles SKELETON: - laryngeal cartilages
9
Q
1st Pharyngeal pouch
A
middle ear
auditory tube
10
Q
2nd Pharyngeal pouch
A
palatine tonsils
tonsillar fossa
11
Q
3rd Pharyngeal pouch
A
inferior parathyroid gland
thymus gland
12
Q
4th Pharyngeal pouch
A
superior parathyroid gland
ultimobrachial body
13
Q
1st Pharyngeal cleft
A
external acoustic meatus
eardrum