Skull Flashcards
Foramen spinosum
- Middle meningeal artery
2. Meningeal branch of mandibular nerve
Foramen ovale
- Otic ganglion
- mandibular division of trigeminal
- Accessory meningeal artery
- Lesser petrosal nerve
- Emissary veins
Foramen rotundum
Maxillary division of trigeminal
Foramen lacerum
- Base of medial pterygoid plate
- Internal carotid artery - transverses upper 3rd
- Nerve and artery of pterygoid canal
Jugular foramen
- Anterior - inferior petrosal sinus
- Intermediate - glossopharyngeal, vagus, accessory
- Posterior - sigmoid sinus (becoming the internal jugular vein) and some meningeal branches from the occipital and ascending pharyngeal arteries
Foramen magnum
- Anterior and posterior spinal arteries
- Vertebral arteries
- Medulla oblongata
Stylomastoid foramen
- Stylomastoid artery
2. Facial artery
Superior orbital fissure
tendons of lateral rectus divide fissure in to superior and inferior parts
Superior part
1. Trochlear nerve (IV)
2. Frontal and lacrimal nerves branches of opthalmic nerve V1
3. Superior orbital vein
Inferior
- Occullomotor nerve (III)
- nasociliary branches of opthalmic nerve V1
- Abducent nerve (VI)
- Inferior orbital vein
Blood supply to scalp
- External carotid artery - superficial temporal, posterior Auricular, occipital branches
- Internal carotid artery - supratrochlear and supraorbital branches of opthalmic artery
Cribriform plate
Olfactory nerve (CN I)
Carotid canal
Internal carotid artery
Inferior orbital fissure
- Zygomatic branch of maxillary nerve
- Infraorbital artery
- Infra orbital vein
Optic canal
Optic nerve (CN I)
Nerve supply to scalp
- Supratrochlear and supraorbital branches of trigeminal nerve - anterior
- Posterior rami of C2 and C3 - posterior
- Auricotemporal nerve - lateral
What does the nasociliary nerve supply
- Ethmoidal sinuses
- Sphenoidal sinuses
- Skin upper eyelid and nose
Inferior ramus of Oculomotor nerve
- Inferior rectus
- Medial rectus
- Inferior oblique
The superior ramus of Oculomotor nerve
- Levatorpalpebrea superioris
May give rise to Ptosis if cut
Facial nerve - intracranial branches
- Greater petrosal nerve
- Nerve to stapedius
- Chorda tympani
Facial nerve - extra cranial branches
- Posterior Auricular nerve
- Branch to posterior belly of digastric as well as stylohyoid muscle
- Temporal branch of facial nerve
- Zygomatic branch of facial nerve
- Buccal branch of facial nerve
- Marginal mandibular branch of facial nerve
- Cervical branch of facial nerve
Cavernous sinus
Situated bilaterally on each side of the sella turcica on the upper body of the phenoid
Lies both beneath and lateral to pituitary gland
Each sinus extends from superior orbital fissure in front to the apex of the PETROUS part of temporal bone behind
Both opthalmic and maxillary divisions of the trigeminal nerve run forward of the lateral walls of sinus
Both 3rd and 4th CN run through the lateral wall of the sinus
Unpaired cranial venous sinus
Superior Sagittal sinus
Cranial venous sinuses
- Superior Sagittal sinus
- Inferior Sagittal sinus
- Straight sinus
- Transverse sinus
- Sigmoid sinus
- Confluence of sinuses
- Occipital sinus
- Cavernous sinus
What does the inferior Sagittal sinus drain in to?
Strait sinus
What does the superior Sagittal sinus drain in to?
Typically becomes right transverse sinus or confluence of sinus
What does the strait sinus drain in to?
Typically becomes left transverse sinus or confluence of sinuses
What does the occipital sinus drain in to?
Confluence of sinuses
What does the sphenoparietal sinus drain in to?
Cavernous sinuses
What does the cavernous sinuses drain in to?
Superior and inferior petrosal sinus
What does the superior petrosal sinus drain in to?
Transverse sinus
What does the transverse sinus drain in to?
Sigmoid sinus
What does the inferior petrosal sinus drain in to?
Internal jugular vein
What does the sigmoid sinus drain in to?
Internal jugular vein
