Dural Sinuses Flashcards
At the point of crossing
Trochlear Nerve
In font of the crossing point
Oculomotor Nerve
Anterior clinoid process
Free margin
Posterior clinoid process
Attached margin
Occipital sinus
Falx cerebelli
Attached to the anterior and posterior clinoid processes
Diaphragma sellae
Attached to the internal occipital crest and inferior surface of tentorium cerebelli
Falx cerebelli
It ends by passing through the posterior compartment of the jugular foramen to continue as the internal jugular vein.
Sigmoid sinus
The right sinus is usually bigger than the left, because?
it is usually the continuation of the superior sagittal sinus.
It may open into a dilatation called confluence of sinuses at the internal occipital protuberance.
Superior sagittal sinus
They form with the cavernous sinuses a venous circle (circular sinus) around the hypophysis cerebri.
Intercavernous sinuses
It is the smallest of the cranial sinuses.
Occipital sinus
It is situated in the attached margin of the falx cerebelli.
Occipital sinus
- It is usually single, but occasionally there are two, right and left sinuses. They arise from the right and left transverse sinuses. They fuse together to form a single sinus which ends into the sigmoid sinus in each side. It communicates around the margin of the foramen magnum by several small meningeal veins.
Occipital sinus
Occipital artery
External carotid artery
Supratrochlear and supraorbital
Internal carotid artery
Superifical temporal
External carotid artery
Posterior auricular
External carotid artery
Angular artery
Facial artery
It has a lower border which is concave and free
Falx cerebri
It forms the tentorial notch around the midbrain
Free margin of tentorium cerebelli
It runs along the posterior half or two thirds of the free margin of falx cerebri
Inferior sagittal sinus
SS is formed by?
The union of ISS and great cerebral vein
Uncus of temporal bone and trigeminal ganglion
Lateral relation of cavernous sinus
Sphenoidal air sinus
Medial boundary of cavernous sinus
Speration of the scalp from the skull occurs at which layer
4th
A layer in the scalp that bleeds profusely of injured?
Second layer
Bleeding in this layer may reach eyelids and cause black eyes
4th layer
Facial artery terminates as
Angular artery
Dangerous position of external jugular vein
1 inch above the clavicle where it pierces the deep fascia of the roof of the posterior triangle
Opthalmic nerve
Supraorbital supratrochlear lacrimal infra trochlear external nasal
Maxillary
Infraorbital, zygomaticotemporal, zygomaticofacial
Mandibular sensory branches
Meningeal
Buccal
Auriculotemporal
Lingual
Mental
Cavernous sinus comminicates with
With the facial vein through
through the superior ophthalmic vein.
Cavernous sinus communicates With the pterygoid and pharyngeal plexus of veins through emissary veins passing through
foramen ovale or foramen lacerum.
Cavernous sinus drains to transverse sinus and internal jugular vein through
- Through the superior petrosal sinus to end in the transverse sinus.
- Through the inferior petrosal sinus to end in the internal jugular vein
Infection of cavernous sinus is transmiited to the brain through
middle cerebral vein.
Infection of cavernous sinus causes exopthalmos through
Internal carotid artery
Sphenoparietal
Paired venous sinuses
Tributaries of cavernous sinus
Greater auricular nerve is related to the auricle
Posterior
auriculotemporal nerve is related to the auricle
Anteriorly
Nerves posterior to the auricle are supplied by
Cervical spinal nerves
Sternomastoid (sternocleidomastoid) muscle
spinal accessory nerve (XI), with sensory supply from C2 & C3 (for proprioception).
Omohyoid muscle
ansa cervicalis.
Transverse cervical nerve is from which category of the nerves in the posterior triangle
Cutanous branches of the cervical plexus
Which auricular nerve is present in the posterior triangle, is it in front of the ear or posterior to it
Great auricular, posterior
Which belly of omohyoid is in the posterior triangle
Inferior belly
Which lymph nodes are present in posterior triangle
Occipital and supraclavicular lymph nodes
Which s is the first s in the posterior triangle
Scalenus medius
Superomedial boundary
rectus capitis posterior major.
Superolateral boundary of suboccipital triangle
superior oblique of head (= obliquus capitis superior).
Which part of nerve 11 is present in posterior triangle
Spinal
Floor of suboccipital triangle
posterior atlanto-occipital membrane and posterior arch of atlas
semispinalis capitis & splenius capitis.
-Floor of the posterior triangle
-roof of suboccipital triangle
Infrahyoid muscles supply
All infrahyoid muscles are supplied by ansa cervicalis (Cl, C2&C3) except thyrohyoid
muscle (supplied by Cl only).
Anterior facial vein is present in which triangle
Digastric
Nerve to mylohyoid
Submental triangle
Digastric triangle
