Unit 4 - Head and Neck: Scalp (Ex. III)

Question 1

boundaries

Answer 1

from S nuchal lines of O bone to supraorbital ridge of F bone

Question 2

layers

Answer 2

S ==> skin
C ==> connective tissue containing neurovasculature
A ==> aponeurosis of occipitofrontalis, tempoparietalis, and S auricular muscles
L ==> loose areolar tissue
P ==> periosteum

Question 3

What lie in the loose connective tissue layer?

Answer 3

muscles of facial expression

• originate on bones of face
• insert into overlying skin

Question 4

From what a. are the branches that supply the face and scalp?

Answer 4

EXTERNAL carotid a.

• S and I labial aa. –> lips
• L nasal a.
• angular branches of facial a.
• mental branch of I alveolar a. –> chin
• superficial temporal a.
• P auricular a.
• occipital a.
• supratrochlear and supraorbital branches of ophthalmic a. (branch of INTERNAL) ==> anastomose w/ angular a.

Question 5

sensory nn. of face and scalp

Answer 5

supraorbital and supratrochlear nn. (CN V1)
infraorbital n. and zygomaticotemporal and zygomaticofacial n. (V2)
auriculotemporal n., buccal n., and mental n. (branch of I alveolar n.) (V3)
great auricular n. and lesser occipital n. –> A rami of C2 and C3 via C plexus
greater occipital n. and 3rd occipital n. –> P rami of C2 and C3

Question 6

motor nn. of face and scalp

Answer 6

temporal, zygomatic, buccal, and marginal mandibular branches of facial n. (CN VII) ==> facial muscles
T and P auricular branches of facial n. ==> scalp muscles
muscular branches of mandibular division of trigeminal n. (CN V3) ==> muscles of mastication

Question 7

What does it cover?

Answer 7

neurocranium