25 topics with concise breakdowns: definitions, key facts, and class questions.
This section covers the layered structure, syntopy, and blood supply of the neurocranium and viscerocranium. This is an extremely complex anatomical region where vital neurovascular bundles, sensory organs, and the brain are concentrated within a minimal area.
The material is divided into two major blocks. The first is dedicated to the neurocranium: the cranial vault, temporal and mastoid regions, craniocerebral topography, meninges, and venous sinuses. The second block details the viscerocranium: the orbit and organ of hearing, the nasal cavity with paranasal sinuses, the oral region, as well as the complex architecture of the deep and superficial lateral facial regions (including the parotid-masseteric and buccal zones).
During practical classes and colloquia, instructors most commonly ask about the pathways of purulent infection spread through fascial spaces, venous anastomoses (especially in the context of the risk of dural venous sinus thrombosis), the topography of the branches of the trigeminal and facial nerves, and the scheme of craniocerebral topography.
Why do head wounds bleed so heavily and fail to collapse?
The vessels of the cranial vault lie in the subcutaneous tissue, and their adventitia is firmly fused with fibrous septa. Because of this, upon injury, vessel lumens remain open (do not collapse), leading to profuse bleeding.
What is the clinical hazard of the subaponeurotic space?
Parietal emissary veins run through the loose areolar tissue of this space. In purulent processes, infection can easily spread through them into the superior sagittal sinus of the dura mater.
Where is the interaponeurotic adipose tissue located in the temporal region?
It lies between the superficial and deep layers of the temporal fascia, which splits approximately 3–4 cm above the zygomatic arch.
Why is it necessary to know the projection of the middle meningeal artery?
Rupture of this artery during a cranial trauma causes rapid and dangerous epidural hematomas. Knowledge of its projection is essential for correctly selecting the trepanation burr hole site.
In which quadrant of the mastoid process is the sigmoid sinus located?
The sigmoid venous sinus projects into the posteroinferior quadrant of the mastoid process.
How does the epidural space differ from the subdural space?
The epidural space is located between the cranial bones and the dura mater; normally it is absent and appears only upon blood accumulation. The subdural space is a permanently existing cleft between the dura mater and the arachnoid mater.
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