Skull Base Dr Supreet Singh Nayyar AFMC For more presentations visit wwwnayyarENTcom wwwnayyarENTcom 1 Topography of Skull Base Boundaries Anterior Incisors upper teeth ID: 136496
Download Presentation The PPT/PDF document "Surgical Anatomy of" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
Surgical Anatomy of Skull Base
Dr. Supreet Singh Nayyar, AFMCFor more presentations, visit www.nayyarENT.com
www.nayyarENT.com
1Slide2
Topography of Skull Base
Boundaries : Anterior : Incisors upper teeth Posterior: Superior nuchal line
Lateral : Upper lateral teeth
Zygomatic
arch Mastoid process
www.nayyarENT.com
2Slide3
Anterior Skull Base
Central Skull Base
Posterior Skull Base
Topography of Skull Base
www.nayyarENT.com
3Slide4
Skull Base Anatomy Review
Key Openings
Foramen spinosum
Foramen ovale
Foramen lacerum
Foramen rotundum
Foramen magnum
Foramen of vesalius
Jugular foramen
Superior orbital fissure
Inferior orbital fissure
Optic canal
Vidian canal
Hypoglossal canal
Pterygopalatine fossa
www.nayyarENT.com
4Slide5
Skull Base Anatomy Review
Foramen magnum
Medulla oblongata
Vertebral arteries
Anterior/Posterior spinal arteries
Hypoglossal canal
Hypoglossal nerve
Hypoglossal artery
Jugular Foramen
Pars nervosa: CN IX, inferior petrosal sinus
Pars vascularis: CN X, XI, jugular bulb
www.nayyarENT.com
5Slide6
Skull Base Anatomy Review
Foramen Spinosum
Middle meningeal artery
Recurrent branch of mandibular nerve
Foramen Ovale
Mandibular nerve
Accessory meningeal artery
Lesser petrosal nerve
Emissary veins
Foramen of Vesalius
Sphenoidal Emissary vein
Stylomastoid foramen
Facial nerve
Stylomastoid artery
www.nayyarENT.com
6Slide7
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
7Slide8
Receives: Superior opthalmic vein Inferior opthalmic vein Sphenoparietal sinus
Drains via: Petrosal sinuses Basilar plexus Pterygoid plexus
Connection: Circular sinus
Contains: CN III, IV, V
1
, V
2,
VI
Skull Base Anatomy Review
Cavernous Sinus
Meckel’s Cave
Posterior aspect of cavernous sinus
Gasserian ganglion (sensory root ganglion of CN V)
www.nayyarENT.com
8Slide9
Skull Base Anatomy Review
Superior Orbital Fissure
CN III, IV, V
1
, VI
Middle meningeal artery- orbital branch
Recurrent meningeal artery
Superior ophthalmic vein
Inferior Orbital Fissure
Infraorbital artery, vein, and nerve (V
2
branch)
Optic Canal
Optic nerve
Ophthalmic artery
www.nayyarENT.com
9Slide10
Central Skull Base
www.nayyarENT.com10Slide11
Central Skull Base
1www.nayyarENT.com11
1
2
3
6
5
4
1- Pharyngeal Area
2- Tubal Area
3- Neurovascular Area
4- Auditory Area
5- Articular Area
6-
Infratemporal
FossSlide12
Pharyngeal Area
Roof of Nasopharynx Boundaries of Nasopharynx : * Anterior
* Lateral & Posterior * Inferior
www.nayyarENT.com
12Slide13
Pharyngeal Area
Pharyngobasilar fasia Fossa of Rosenmullar * Location- above &
behind medial end ET
* Depth- 2.5 cm
* Apex- Carotid canal
opening (post) & f. ovale, f. spinosum
(lat) * Base- below
Foramen lacerum
www.nayyarENT.com
13Slide14
Tubal Area
Eustachian Tube Scaphoid fossa Runs b/w petrous bone & greater wing
sphenoid Opening- nasopharynx
Paratubal muscles
www.nayyarENT.com
14Slide15
Neurovascular Area
Important structures are: Carotid sheath & its contents Styloid apparatus
Facial Nerve
www.nayyarENT.com
15Slide16
Carotid Sheath
Compact network of aerolar tissue Carotid canal to arch of aorta
Encloses : ICA above & CCA below
IJV
Vagus nerve
Carotid Canal : ICA & Carotid plexus
sympathetic nerve
Parts of ICA
www.nayyarENT.com
16Slide17
Divided into three compartments
www.nayyarENT.com17
Jugular Foramen
Compartments
Contents ( lateral
to medial )
Anterior
* IX Nerve
* Inferior petrosal
Sinus
Middle
* XI Nerve
* X Nerve
Posterior
* IJVSlide18
Styloid Apparatus
Bone- Styloid bone
Ligaments- * Stylohyoid * Stylomandibular
Muscles- * Stylohoid
* Stylopharyngeus
* Styloglossus
www.nayyarENT.com
18Slide19
Facial Nerve
Arise from Stylomastoid Foramen Branches: i) Post auricular nerve ii) Digastric branch
iii) Temporofacial branch iv) Cervicofacial branch
www.nayyarENT.com
19Slide20
Auditory Area
Petrotympanic fissure of Glaser: * Chorda tympani * Ant br of
tympanic artery
www.nayyarENT.com
20Slide21
Infratemporal Fossa
Location : below middle cranial fossa Boundaries
Contents: * Med & Lat Pterygoid M
* Maxillary A
* Maxillary V
* Pterygoid Venous Plexus * Br of Mandibular N
www.nayyarENT.com
21Slide22
Pterygopalatine Fossa
Small inverted pyramid shaped fossa Location
Boundaries
Communications
www.nayyarENT.com
22Slide23
Anterior Cranial Base
www.nayyarENT.com23Slide24
Anterior Cranial Base from inside
www.nayyarENT.com
24Slide25
Floor of Anterior Cranial Fossa
www.nayyarENT.com
25
Depth of Olfactory
fossa (Keros classification)
* Type I – 1-3mm
* Type II- 4-7mm
* Type III- 8-17mmSlide26
Thank you
For more presentations, visit www.nayyarENT.comwww.nayyarENT.com
26