2d. Spinal Reflexes Flashcards
Patella Reflex
- Neurones
Tapping of the short patella tendon.
Sensory neurones to the spinal cord
Motor neurones to the quadriceps muscle
Sensory neurone also activates inhibitory interneurones that innervate the hamstrings = relaxation
Patella Reflex
- Nerve
Femoral nerve arising from L4-6
Patella Reflex
- Function
Support the body when weight is applied to the left
Calcanean Reflex
- Neurones
Tapping of the Achilles tendon
Sensory neurones to the spinal cord
Motor neurones to gastrocnemius = contraction
Calcanean Reflex
- Nerve
Tibial nerve arising from L6-S2
Biceps Reflex
- Neurones
Tapping the tendon of insertion of the biceps brachii
Sensory neurones to the spinal cord
Motor neurones to biceps brachii = contraction
Biceps Reflex
- Nerve
Musculocutaneous nerve
Triceps Reflex
- Neurones
Tapping the tendon of insertion of the triceps
Sensory neurones to the spinal cord
Motor neurones to triceps = contraction
Triceps Reflex
- Nerve
Radial nerve
Tendon Reflexes
- 4
- Patella reflex
- Calcanean reflex
- Biceps reflex
- Triceps reflex
Panniculus Reflex
- Neurones
Scratching the trunk
Sensory neurones to spinal cord
Motor neurones to the panniculus muscle = contraction
Panniculus Reflex
- Nerves
Sensory branch in segmental nerves arising from T1-L1
Motor branch is lateral thoracic nerve arising from C8-T1
Panniculus Reflex
- Function
Expel flies from the skin
Anal Reflex
- Neurones
Touching anus
Sensory neurones to spinal cord
Motor neurones to anus = contraction
Motor neurones to tail = contraction and lowering
Anal Reflex
- Nerves
Sensory branch in pudendal nerve arising from S1-S3
Motor branch to anus arises from S1-3
Motor branch to tail in caudal nerve roots
Flexor/Withdraw Reflex
- Neurones
Pinching one of the digits
Sensory neurone to spinal cord
Motor neurones to flexor muscles = contraction and limb flexion
Flexor/Withdraw Reflex
- Function
Withdraw limb from pain
Does not mean that the animal is conscious of pain
Crossed Extensors Reflex
- Neurones
Pinching one of the digits
Sensory neurone to spinal cord
Interneurones cross to the contralateral side
Motor neurones to extensors =
Crossed Extensor Reflex
- Function
Pain in the digits triggers extension of the contralateral limb to support the body when the affected limb is withdrawn from the painful stimulus.
Does not occur in normal recumbent animals
