Lecture 3

Question 1

Parotid gland

Answer 1

Largest of 3 main salivary glands

Ant to and below lower ½ of ear

Superficial, posteriorand deep to ramus of mandible

Extends to lower border of mandibleand up to zygomatic arch

Posteriorly covered by SCM and continues superficially across masseter

Duct crosses ant border of masseter, turns through buccal pad of fat, pierces buccinatorand exits opposite 2nd upper molartooth

Contains ECA, Retromandibular v & Facial n

Enclosed within the split investing layerof deep cervical fascia

Blood supply via branches of ECA

Sensory nerve supplyby auriculotemporal from V3

Parasympathetic (secretomotor) supply = lesser petrosal n, branch of glossopharyngeal n (CN IX) via the auriculotemporal n

Question 2

Parotid bed

Answer 2

Between mastoid & mandibular ramus
Base related to zygomatic arch
Apex post to angle of mandible
Posterior belly of digastric
Auriculotemporal nerve
Stylohyoid m
Medial pterygoid
Mandibular ramus
Masseter

Question 3

Eyelids

Answer 3

NB:

Superior tarsal muscle contains smooth muscle fibres – supplied by sympathetic system of ANS

If damaged (Horner’s Syndrome) = ptosis which differs from that caused by lesion to CN III

Question 4

Scalp

Answer 4

Tough and difficult

Layers

Question 5

Scalp layers

Answer 5

Skin (with or without hair, rich blood supply, venous and lymph drainage )
Connective tissue (dense with adipose tissue)
Aponeurosis (epicranium with occipitofrontalism bellies)

S, C & A work together (scalp proper)

Loose areolar tissue (with potential space –allows free movement of S, C & A)
Periosteum (pericranium)