Spinal Nerves and Reflexes
Spinal Nerves and Reflexes ANAT 3001
U of M
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This 3 page Class Notes was uploaded by alliemartinnn Notetaker on Monday March 28, 2016. The Class Notes belongs to ANAT 3001 at University of Minnesota taught by Barnett, Vincent; Cook, Mark in Fall 2015. Since its upload, it has received 18 views. For similar materials see Human Anatomy in Anatomy at University of Minnesota.
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Date Created: 03/28/16
Spinal Nerves and Reflexes Lower Extremity Nerves ● Femoral Nerve ○ Innervation= muscles of anterior thigh ○ Action= flex hip and extend knee ○ Skin Connection= anterior thigh and medial leg ● Obturator Nerve ○ Innervation= muscles of medial thigh ○ Action= adduction ○ Skin Connection= upper and inner thigh ● Tibial Nerve *part of sciatic nerve ○ Innervation= muscles of the posterior thigh and leg ○ Action= knee, plantar and toe flexion, hamstrings (hip flexion, knee flexion) ○ Skin Connection: bottom of foot ● Common Fibular Nerve *part of sciatic nerve ○ Innervation= anterior and lateral leg ○ 2 Branches of the Nerve ■ Superficial Fibular Nerve ● Innervation= muscles in lateral leg (fibularis longus & brevis) ● Action= evert the foot ● Skin Connection= dorsum (top) of foot except between first 2 toes ■ Deep Fibular Nerve ● Innervation= muscles in anterior leg (tibialis anterior, extensor hallucis longus, extensor digitorum longus ● Action= dorsiflexion of foot, extension of toes ● Skin Connection= skin between first 2 toes (top of foot) Reflexes ● Monosynaptic Reflex ○ Direct communication between sensory and motor neuron ○ Unipolar cell ○ Enters back side of spinal cord, passes through Dorsal Horn to Anterior Horn ○ Deep Tendon Reflexes (DTR) ■ Elicited by a quick, small stretch to a skeletal muscle ■ Contracts only the muscle that is being stretched ● Polysynaptic Reflexes ○ Interneuron facilitates sensorymotor communication ■ Synapse b/w interneuron & sensory neuron and interneuron & motor neuron ○ Stimulated by pain being detected on skin ○ Activates sensory neurons from skin, interneuron sends axon to Anterior Horn, motor neuron goes out to muscles to create a response ○ Almost always involves multiple muscles Pathways and Integrative Function ● Regions of the Spinal Cord ○ White Matter ■ Posterior Funiculus ■ Lateral Funiculus ■ Anterior Funiculus ■ White Commissure ○ Gray Matter ■ Posterior Horn ■ Lateral Horn ■ Anterior Horn ■ Gray Commissure ● Pathways ○ Posterior Funiculus Medial Lemniscal Pathway ■ Carries discriminative (fine/light) touch sensations ■ Unipolar neurons carry sensations ■ Primary Neuron ● Signal goes up to Medulla Oblongata ■ Secondary Neurons ● Signals cross to the opposite side of Medulla Oblongata to get to Thalamus ■ Tertiary Neurons ● Signals sent to Cerebral Cortex (Parietal Lobe, Postcentral Gyrus) ■ Located in Posterior Funiculus ○ Anterolateral Pathway ■ Carries pain and temp and crude (deep) pressure information from the skin ■ Unipolar neurons carry sensations ■ Primary Neuron ● Travel to the Posterior Horn (Interneurons) ■ Secondary Neurons ● Info travels to other side of Spinal Cord to go to Thalamus ■ Tertiary Neurons ● Signals sent to Cerebral Cortex (Parietal Lobe, Postcentral Gyrus) ■ Anterior Spinothalamic Tracts ● For pain and temp ■ Lateral Spinothalamic Tract ● For crude touch ■ Located in Anterior and Posterier Funiculi