2/20/16 Head and neck anatomy

Question 1

Muscles of Mastication

• 4 muscles
• innervation
• branchial arch

Answer 1

1. Masseter
2. Temporalis
3. Lateral Pterygoid
4. Medial Pterygoid

Innervated by V3 (mandibular branch

1st branchial arch

Question 2

Pharyngeal/Branchial arch 1

Answer 2

Arch 1: Mandibular arch

muscles of mastication, anterior belly of the digastric, tensor tympani, tensor veli palatini

Bone: maxilla, zygoma, temporal bone, incus and malleus

Nerve: trigeminal nerve

Question 3

Hillocks of His

Answer 3

1-3: 4-6:

Question 4

6th branchial arch

• muscles
• nerves
• vessels
• bones

Answer 4

6th branchial arch

• Muscles of the larynx except the cricothyroid
• vagus and recurrent laryngeal nerves
• pulmonary artery and ductus arteriosus
• cricoid, arytenoids

Question 5

4th Branchial Arch

• muscles
• nerves
• vessels
• bones

Answer 5

4th branchial arch

• cricothyoid, all muscles of palate except tensor veli palatini
• vagus, superior laryngeal nerves
• right = subclavian artery; left = aortic arch
• thyroid

Question 6

Branchial arch 2

• muscles
• nerves
• vessels
• bones

Answer 6

Branchial arch 2 = hyoid

• muscles of facial expression, everything innervated by the facial nerve, buccinator, stapedius
• Facial nerve
• Stapedial artery, hyoid artery
• stapes, hyoid
• *

Question 7

Branchial arch 3

Answer 7

• Stylopharyngeus
• hyoid, thymus
• glossopharyngeal nerve
• common carotid, internal carotid

Question 8

Newborn infant with cyanosis that resolves with crying

Answer 8

choanal atresia. infants are obligate nasal breathers so crying would cause it to breathe through its mouth.