PNS Flashcards
1
Q
Autonomic NS - functions?
A
- supplies viscera (internal organs): glands, smooth muscle, cardia muscle, visceral membranes, but involuntary or autonomous control
- motor: sympathetic, parasympathetic
- sensory: visceral afferents - pain
2
Q
Somatic NS - functions?
A
- supplies somatic (body wall) structures - skin, muscle, bone, parietal membranes
- motor: skeletal muscle - voluntary control
- sensory: pain (sharp, well localized direct pain) temperature, touch, proprioception
3
Q
Pain info from autonomic nervous sytem?
A
- visceral afferents: different kinds of pain as from somatic:
- stretch or ischemia (lack of O2) at organs
- percieved as indirect or reffered pain - usually refrred to the dermatomes
- vague, ill defined, ache like (menstrual cramps, indigestion)
4
Q
Spinal vs Cranial Nerve
A
- spinal: from spinal cord
- cranial: emerge from brain stem
5
Q
Spinal Nerves - #
A
- 31 pairs of spinal nerves
- 8 cervical
- 12 thoracic
- 5 lumbar
- 5 sacral
- 1 coccygeal
- correspond to vertebrae, except only 7 cervical vertebrae
6
Q
Classification of Spinal Nerves - two types?
A
- General Afferents - carry info towards spinal cord /brain
- General Efferents -fibers emerging FROM spinal cord to viscera/somatic
7
Q
General Afferents
A
- spinal nerves
- somatic afferents - GSA: pain, temp, touch, proprioception from boddy wall
- visceral afferents - GVA: pain, distension, chemical from visceral structures
8
Q
General Efferents
A
- spinal nerves
- somatic - GSE: motor neurons in ventral horn projecting to skeletal muscles
- visceral - GVE: autonomic fibers innervating smooth muscle, cardiac muscle, glands
9
Q
What’s in a nerve?
A
- spinal nerve with epineurium around entire nerve
- bunc of fasicles with perineurium around individual fasicles
- buncho f axons with endoneurium
10
Q
Somatic Nerve Plexuses (3)
A
- brachial plexus: upper extremity
- lumbar plexus: lower anterior abdominal wall, medial and anterior thigh, inguinal region
- lumbosacral plexus: gluteal region, lower extremity, perineal region and genitals
11
Q
Brachial Plexus - nerves?
A
- ventral primary rami of spinal nerves C5, C6, C7, C8 and T1
- creates 5 main nerves: axillary, median, musculocutaneus, radial, ulnar - UM ARM
12
Q
Lumbar Plexus - nerves
A
- ventral primary rami of spinal nerves L1, L2, L3, L4
- creates siz main nervs: illiohypogastric, illioinguinal, genitofemoral, lateral femoral cutaneous, femoral, obturator
- GIF, OIL
13
Q
Lumbosacral Plexus - jenrves
A
- ventral primary rami of spinal nerves L4, L5, S1, S2, S3
- 6 main nerves: tibial, common pernoeal, superior gluteal, inferior gluteal, pudenal, posterior fermoral cutaneous
- TIPS PC
14
Q
Autonomic motor Nerves - para and symp?
A
- sympa: thoraculumbar - T1 to L2
- fright, flight, fight
- para: craniosacral: CNIII, VII, IX, X, S2, S3, S4
- rest, relax, regenerate
15
Q
Common Final Pathway
A
- somatic motor system
- one axon emerges from CNS, travels to effector site
