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Neuron etc Anatomy
NPTE Neuromuscular
Question | Answer |
---|---|
Meninges | Dura mater, arachnoid, pia mater |
Outer tough fibrous membrane | Dura mater |
Delicate middle vascular membrane | Arachnoid |
Thin vascular membrane on brain surface | pia mater |
Formed by arachnoid & pia, contains CSF and cisterns | Subarachnoid space |
Cavities filled with CSF that communicate with SC | ventricles- lateral, third, fourth |
Large irregularly shaped ventricle with horns, communicates with 3rd ventricle | Lateral ventricles |
Ventricle located posterior & deep between thalami | Third ventricle |
Communicates 3rd & 4th ventricle | Cerebral aquaduct |
Pyramid shaped, loced in pons and medulla | 4th ventricle |
Selective restriction of blood borne substances from entering CNS | Blood brain barrier |
Blood supply to brain | carotid system, vertebrobasilar system, Circle of Willis |
Venous drainage from brain | cerebral veins and dural venous sinuses |
Support cells that do not transmit signals | neuroglia |
Large myelinated fast conducting nerve fibers | A fibers |
A fibers for proprioception, somatic motor | Alpha |
A fibers for touch, pressure | Beta |
A fibers motor to muscle spindles | Gamma |
A fibers for pain, temp, touch | Delta |
Small, myelinated, conduct less rapidly, preganglionic autonomic | B fibers |
Smallest, unmyelinated, slowest conducting fibers | C fibers |
C fibers for pain, reflex responses | Dorsal root |
C fibers for postganglionic sympathetic | Sympathetic |
Ventral root of spinal nerves | Motor fibers to voluntary muscles |
Dorsal root of spinal nerves | Sensory fibers from sensory receptors |
SC ends at what level in adults | L1 |
Anterior ramus of spinal nerves supply? | muscles and skin of anterolateral body wall and limbs |
Posterior ramus of spinal nerves supply? | muscles and skin of back |
Cervical plexus arises from | C1 to C4 nerve roots |
Brachial plexus arises from | C5-T1 |
Lumbar plexus arises from | T12-L4 |
Sacral plexus arises from | L4-S3 |