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Spinal cord (gross structure)
- Conus Medularis-terminal end, cone shaped, above...
- Cauda Equina-"horse tail" inferior end
- Filum Terminale-Fibrous extensions of pia mater
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Cervical Plexus...
Phrenic Nerve-Diaphram
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Brachial Plexus...
- Axillary Nerve-Deltoid (501-26)
- Musculocutaneous-Bicep Brachii (501-21)
- Median-Palmaris Longus (501-23)
- Radial-Tricep brachii (501-22)
- Ulnar-Flexor carpi ulnaris (501-24)
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Lumbosacral Plexus...
- Femoral-Quadriceps (503-34)
- Saphenous-(503-38)
- Obturator-Adductor Magnus Longus/brevis (503-36)
- Lateral Femoral Cutaneous Nerve-Skin of lateral thigh (503-33)
- Sciatic-2 nerves, tibial & common fibular, common sheath
- Tibial-Hamstrings (posterior 504-44)
- Common Fibular- Short head biceps femoris (504-37)
- Deep Fibular-(Anterior 504-40)
- Superficial Fibular-(Anterior 504-41)
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Autonomic N.S...
- Parasympathetic-craniosacral division, rest and relax
- Sympathetic-thorocolumbar division, fight or flight, maintain homeostasis
- White ramus communicans
- Sympathetic trunk-lie alongside vertebral column
- Gray ramus communicans-where postganglionic axons reenter spinal nerve
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Reflex Arc...
- 1.Receptor-Stimulus
- 2.Sensory Neuron-Afferent
- 3.Integration Center-In spine
- 4.Motor Neuron-Efferent
- 5.Effector-Response
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Somatic Reflexes
- Postural reflex, maintain posture, balance, locomotion
- Patellar reflex-knee jerk
- Achilles reflex
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Autonomic reflexes
- Pupillary reflex-pupil constricts
- Salivary reflex-glandular
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Sensory Receptors
- Exteroreceptors-react to external stimuli, near surface of skin (pacinian corpuscle)
- Interoreceptors-(visceroreceptors) react to internal stimuli, internal organs (chemoreceptors)
- Proprioceptors-internal stimuli, skeletal muscle, joints, tendons, ligaments, C.T.
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General Sensory Receptors
- Cutaneous...
- Merkel Discs-pain receptor, temp, naked nerve endings
- Root Hair Plexuses-hair movement, light touch
- Meissners Corpuscles-touch, light pressure, in dermal papillae
- Pacinian Corpuscles-deep pressure, high frequency vibration, deep in dermis
- Proprioreceptors...
- Muscle Spindles
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