Part 5: Peripheral & autonomic nervous systems Flashcards
(52 cards)
Brain splits into ___ (3 parts)
-Forebrain
-Midbrain
-Hindbrain
Cranial Nerves emerge from ____
brain stem
spinal Nerves emerge from ____
spinal cord
Peripheral Ganglia are (2)
-somatic sensory cell bodies
-autonomic ganglia (postganglionic neuronal cell
bodies)
somatic nervous system Supplies ____
somatic (body wall) structures
- Skin, muscle, bone, parietal membranes
somatic nervous system: sensory (what it senses?)
- Pain (direct pain arising from the site of injury, Sharp, focused and well-localized (pin-prick, cut, burn)
- Temperature
- Touch
- Proprioception
motor somatic nervous system controls ____
skeletal muscle (exception - reflex arc)
autonomic nervous system supplies ____
-viscera (internal organs)
- Glands, smooth muscle, cardiac muscle, visceral membranes
- Involuntary or autonomous control
autonomic nervous system: sensory (what it senses?)
-stretch or ischemia (lack of oxygen) at the organs
- vague, ill-defined and ache-like (menstrual cramps, indigestion)
- perceived as indirect or referred pain
- Usually referred to the dermatomes
autonomic nervous system: motor controls___
sympathetic, parasympathetic
2 Classification of Spinal Nerves
General Afferents
General Efferents
spinal nerves: general afferents two types
Somatic Afferents (GSA)
- Visceral Afferents (GVA)
spinal nerves: Somatic Afferents (GSA) sense ____
-pain, temperature, touch, proprioception from
body wall
spinal nerves: - Visceral Afferents (GVA) sense _____
pain, distension, chemical from visceral
structures
spinal nerves: general efferents two types
Somatic Efferents (GSE)
Visceral Efferents (GVE)
spinal nerves: Somatic Efferents (GSE) sense ____
motor neurons in ventral horn projecting to
skeletal muscles
spinal nerves: Visceral Efferents (GVE) sense ____
autonomic fibres innervating smooth muscle, cardiac muscle, and glands
typical spinal nerve
dorsal root + ventral root=spinal nerve split into dorsal/ventral primary ramus
Intervertebral Foramen
where spinal nerve passes through
what’s in a nerve?
purple: spinal nerve
orange: Blood vessels
yellow: EPINEURIUM around entire nerve
green: Fascicle (bundle of nerve fibers in PNS)
blue: PERINEURIUM around individual fascicle
pink: axon
black: ENDONEURIUM around individual axon
dermatome
an area of skin that is mainly supplied by a single spinal nerve (C1 has no dermatome)
3 Somatic Nerve Plexuses
-Brachial Plexus
-Lumbar Plexus
-Lumbosacral Plexus
Brachial Plexus where?
Ventral primary rami (mixed nerves carrying both motor and sensory fibers) of spinal nerves C5, C6, C7, C8 and T1
Brachial Plexus creates __ main nerves: ____
5 (five)
1. Axillary (shoulder)
2. Musculocutaneous (biceps)
3. Median (forearm flexors, thenar)
4. Radial (posterior arm and forearm)
5. Ulnar (hand muscles)
