29 Questions
Why does the hypothalamus have a higher degree of vascularity compared to other phylogenetically older brain structures?
Because of its crucial role in functions like thermoregulation
Which part of the spinal cord is primarily supplied by radial arteries?
Outer regions of grey matter
Why are arterial anastomoses more profuse on the surface of the brain compared to deep arteries?
To provide alternative channels for blood flow
What makes blockage of deep arteries more catastrophic compared to blockage of surface arteries?
Deep arteries rarely anastomose
Why are large pulsating arteries absent below the neuraxis surface?
To reduce the risk of pressure waves
Which layer of the meninges adheres tightly to the periosteum lining within the cranial cavity?
Dura mater
Where does the vein mentioned in the text terminate at one end?
Facial vein
What is the principal drainage of the connecting sinus?
Maxillary vein
What is a characteristic of cerebral veins mentioned in the text?
They lack valves and smooth muscle
What facilitates alternative channels for blood flow if a cerebral vein is obstructed?
Anastomoses between veins
Where are the longitudinal spinal sinuses located?
Within the epidural space
What is notable about the valves in the longitudinal spinal sinuses?
They are absent, allowing bidirectional blood flow
What is the controversial role of arachnoid granulations in cerebrospinal fluid (CSF) absorption?
Their role in CSF absorption is confirmed in some mammals.
Which statement about the drainage of cerebrospinal fluid (CSF) is accurate?
CSF can be absorbed by perineural lymphatics surrounding cranial and spinal nerves.
What is the function of cerebrospinal fluid (CSF) related to mechanical support?
Supports delicate structures within the cranial cavity.
Where are the main sites for cerebrospinal fluid (CSF) collection in live animals?
At the atlanto-occipital region and lumbosacral region.
Why is the naming and location of the cistern at the atlanto-occipital site confusing?
The naming convention is inconsistent with its actual position.
What distinguishes the composition of cerebrospinal fluid (CSF) from blood plasma?
CSF has metabolic functions different from blood plasma.
What is the function of the cervical and lumbar enlargements in the spinal cord?
Accommodate increased neuron populations for limb innervation
Where does the spinal cord terminate approximately in humans?
Around vertebra L1
What does the filum terminale consist of?
Glial and ependymal cells
What structure resembles a horse's tail and includes sacral and caudal nerves?
Cauda equina
What anatomical feature is formed by the convergence of the filum terminale with the dura mater?
Filum of the dura mater
Around which vertebral segment does the termination point of the dural tube vary?
S1 and S4
Which tract is NOT part of the ascending tracts in the lateral funiculus of the cervical spinal cord?
Rubrospinal tract
Which descending tract is found in the ventral funiculus of the cervical spinal cord?
Tectospinal tract
Which of the following is a short ascending and descending intersegmental fiber of the fasciculus proprius?
Dorsolateral tract (of Lissauer)
Which of these tracts is classified as an ascending tract in the lateral funiculus of the cervical spinal cord?
Spinocervical (spinocervicothalamic) tract
Which of these tracts is part of the descending tracts in the lateral funiculus of the cervical spinal cord?
Tectospinal tract
Explore the vascularity of different brain structures including the spinal cord, rhinencephalon, cerebral cortex, cerebellar cortex, and hypothalamus. Learn about the exceptions to the general rule and understand the crucial role of the hypothalamus in thermoregulation.
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