Surgical Anatomy

Question 1

SCALP layers

Answer 1

Skin
Subcutaneous tissue
Aponeurosis (galea)
Loose areolar tissue
Pericranium

Question 2

Galea extension

Answer 2

Galea = Temporoparietal fascia / superficial temporal fascia = SMAS layer = superficial cervical fascia of neck

Question 3

Pericranium extension

Answer 3

Pericranium = Temporalis fascia / deep temporal fascia (two layers 2cm superior to the zygomatic arch) = parotidomasseteric fascia = deep cervical fascia

Question 4

Facial Nerve Depth

Answer 4

Temporal area - in temporoparietal fascia

Mandible - deep to SMAS layer / in parotidomasseteric fascia

Question 5

Facial Nerve Bifurcation

Answer 5

Bifurcates 1.3cm from stylomastoid meatus, 1.5 - 2.8cm from the most inferior portion of the EAC

Question 6

Facial Nerve Crossing

Answer 6

Crosses the zygomatic arch 0.8 - 3.5cm anterior to the EAC, average 2cm

Question 7

SMAS definition

Answer 7

Superficial musculoaponeurotic system
Platysma, auricularis, risorius, triangularis
Sensory nerves superior, motor nerves deep

Question 8

Superior orbital fissure syndrome

Orbital apex syndrome

Answer 8

CN III, IV, VI, and CN V-1

CN II, III, IV, VI, and CN V-1

Question 9

Distances from lacrimal crest

Answer 9

Anterior Ethmoid - 24mm
Posterior Ethmoid - 36mm
Optic Canal - 42mm

Question 10

Supraorbital / supratrochlear nerves from midline

Answer 10

Supratrochlear - 17mm

Supraorbital - 27mm

Question 11

Internal maxillary artery

Answer 11

25mm superior to the base of the junction of the pterygomaxillary suture