S2A Flashcards
Number of spinal nerve pairs
31
Autonomic Nervous System regulates:
involuntary functions involving viscera and/or homeostasis
Type of CNS matter neuron cell bodies are found in:
Grey matter; Retinas
PNS location of neuron cell bodies:
Autonomic ganglia Enteric nervous system
White matter (centrally) and nerves (peripherally) are formed by:
Axons
Axons in white matter and nerves form:
Tracts
Location of caudal tip of spinal cord:
Opposite L1-2

Location of spinal cord enlargements:
Cervical (C5-T1) Lumbosacral (L1-S2)
Dorsal and ventral nerve roots unite where:
at each intervertebral foramen
Lumbar and sacral roots extend inferiorly forming what structure?
Cauda Equina
Cutaneous territory served by one dorsal root is called:
Dermatome
Block of muscles controlled through one root is called:
Myotome
Segmental organisation of spinal cord is defined by what?
The nerve root pairs
Name fossae of cranium
Anterior Fossa
Middle Fossa
Posterior Fossa

Three layers of meninges
Dura
Arachnoid
Pia
Two ‘reflextions’ of dura that stabilise brain by occupying deep fissues:
Falx and Tentorium
Falx and Tentorium
Reflections of Dura that stabilise the brain by occupying deep fissues. Falx stabilises the longitudinal fissue; Tentorium stabilises the transverse fissure.

Location of CSF within meninges
Subarachnoid space
Is there CSF within the subdural and extradural spaces?
No - they are normally only potential spaces
Two layers of dura:
Periosteal and meningeal
When do the periosteal and meningeal layers of the dura separate and why?
At certaint locations they separate to enclose the dural venous sinuses that drain blood from many cerebral veins.
Role of dural venous sinuses:
To drain blood from many cerebral veins and reabsorb CSF
Largest dural venous sinus
Superior sagittal sinus within the falx
Label:

Clockwise:
Dorsal root
Ventral root
Intervertebral disc: Annulus Fibrosus and Nucelus Pulposus
Foramen transversarium/Transverse foramen
Spinal nerve in perineurium
DRG
Dura
Fat in epidural space






















