Summary of cranial dural sinuses

 Summary of cranial dural sinuses

Cranial dura has two layer : endoesteum layer and meningeal layer

The sinuses of the dura mater are venous channels which drain the blood from the brain;

They are situated between the two layers of the dura mater

They are devoid of valves, and and lined by endothelium but no smooth muscle cells layer.

Different types of dural venous sinus:

1. Pair: cavernous sinus, transverse sinus, sigmoid sinus etc.
2. unpair: superior sagittal sinus, inferior sagittal sinus, straight sinus etc.

Superior sagittal sinus > right transverse sinus > right sigmoid sinus 

> right internal jugular vein

 Inferior sagittal sinus > straight sinus > left transverse sinus 

> left  sigmoid sinus > left internal jugular vein

 The cavernous sinuses are placed one on either side of the body of the 

sphenoid bone, extending from the superior orbital fissure to the apex of the

 petrous portion of the temporal bone.

 Medial wall (central part) is related to –

1. the internal carotid artery,
2. abducent nerve.

Lateral wall : is related to

1. the oculomotor
2. trochlear nerves,
3. the ophthalmic nerves
4. maxillary divisions of the trigeminal nerve  

The cavernous sinus : tributaries :

1. the superior ophthalmic vein
2. superior and inferior  petrosal sinus
3. pterygoid venous plexus veins
4. The two sinuses also communicate with each other by means of the anterior and posterior intercavernous sinuses.

Sulcus (a bony impression)	Structure lodge on sulcus	Bone
Sagittal sulcus	Superior sagittal sinus	Frontal bone, parietal bone, occipital bone
Transverse sulcus	Transverse sinus	occipital bone
Sigmoid sulcus	Sigmoid sinus	Mastoid part of temporal bones

 

q. Identify the Suture :  coranal , sagittal, lamdoid suture

q:  Suture,  what type of joint: fibrous variety

Location of anterior and  posterior frontanelle and their time of closer

Anterior frontanelle : located in between coronal and sagittal suture close : 8–24 months after birth

Pos frontanelle : located in between coronal and lambdoid suture. close : 6–8 weeks after birth