Download Surgical Anatomy of Skull Base

www.nayyarENT.com
1
www.nayyarENT.com
2
Topography of Skull Base
Anterior Skull Base
Central Skull Base
Posterior Skull Base
www.nayyarENT.com
3
Skull Base Anatomy Review
Key Openings
• Foramen spinosum
• Superior orbital fissure
• Foramen ovale
• Inferior orbital fissure
• Foramen lacerum
• Optic canal
• Foramen rotundum
• Vidian canal
• Foramen magnum
• Hypoglossal canal
• Foramen of vesalius
• Pterygopalatine fossa
• Jugular foramen
www.nayyarENT.com
4
Skull Base Anatomy Review
Foramen magnum
Hypoglossal canal
• Medulla oblongata
• Vertebral arteries
• Hypoglossal nerve
• Hypoglossal artery
• Anterior/Posterior spinal
arteries
Jugular Foramen
• Pars nervosa: CN IX, inferior petrosal sinus
• Pars vascularis: CN X, XI, jugular bulb
www.nayyarENT.com
5
Skull Base Anatomy Review
Foramen Spinosum
• Middle meningeal artery
• Recurrent branch of
mandibular nerve
Foramen of Vesalius
• Sphenoidal Emissary vein
Foramen Ovale
Stylomastoid foramen
• Mandibular nerve
• Accessory meningeal artery
• Lesser petrosal nerve
•Facial nerve
•Stylomastoid artery
• Emissary veins
www.nayyarENT.com
6
Skull Base Anatomy Review
Foramen Lacerum
• Ascending pharyngeal artery- meningeal branch
• Nerve of pterygoid canal
Pterygoid canal
• Vidian nerve
• Vidian artery
Foramen rotundum
• Maxillary nerve
• Artery of foramen rotundum
• Emissary veins
www.nayyarENT.com
7
Skull Base Anatomy Review
Cavernous Sinus
Receives:
Superior opthalmic vein
Inferior opthalmic vein
Sphenoparietal sinus
Drains via:
Petrosal sinuses
Basilar plexus
Pterygoid plexus
Connection:
Circular sinus
Contains:
CN III, IV, V1, V2, VI
Meckel’s Cave
• Posterior aspect of cavernous sinus
• Gasserian ganglion (sensory root ganglion of
CN V)
www.nayyarENT.com
8
Skull Base Anatomy Review
Superior Orbital Fissure
• CN III, IV, V1, VI
• Middle meningeal artery- orbital branch
• Recurrent meningeal artery
• Superior ophthalmic vein
Inferior Orbital Fissure
• Infraorbital artery, vein, and nerve (V2 branch)
Optic Canal
• Optic nerve
• Ophthalmic artery
www.nayyarENT.com
9
www.nayyarENT.com
10
6
2
1
5
3
4
1- Pharyngeal Area
2- Tubal Area
3- Neurovascular Area
4- Auditory Area
5- Articular Area
www.nayyarENT.com
6- Infratemporal Foss
11
www.nayyarENT.com
12
www.nayyarENT.com
13
www.nayyarENT.com
14
www.nayyarENT.com
15
www.nayyarENT.com
16
Jugular Foramen
Compartments
Contents ( lateral
to medial )
Anterior
* IX Nerve
* Inferior petrosal
Sinus
Middle
* XI Nerve
* X Nerve
* IJV www.nayyarENT.com
Posterior
17
www.nayyarENT.com
18
www.nayyarENT.com
19
www.nayyarENT.com
20
www.nayyarENT.com
21
www.nayyarENT.com
22
www.nayyarENT.com
23
www.nayyarENT.com
24

Depth of Olfactory
fossa (Keros classification)
* Type I – 1-3mm
* Type II- 4-7mm
* Type III- 8-17mm
www.nayyarENT.com
25
www.nayyarENT.com
26