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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