Bio 103 Human Anatomy Muscle and Spinal Cord Notes
Bio 103 Human Anatomy Muscle and Spinal Cord Notes Biology 103
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This 0 page Class Notes was uploaded by Erika Chalker on Saturday March 5, 2016. The Class Notes belongs to Biology 103 at California State University Chico taught by Gary Arnet in Fall 2016. Since its upload, it has received 18 views. For similar materials see Principles of Human Anatomy in Biology at California State University Chico.
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Date Created: 03/05/16
Muscles and Spinal Cord Spinal Cord Connects to the Peripheral Nervous System 0 Conduction Sends info up and down the body 0 Locomotion Central pattern generators o Re exes Involuntary stereotyped responses Spinal Cord Regions 0 Cervical neck area Nerves go to the arms 0 Thoracic chest area 0 Lumbar lower back Nerves go to the legs 0 Sacral close to tailbone Medullary Cone Found in L1 and is cone shaped Cauda Equina Individual nerves Meninges Protects the Central Nervous System Has 3 layers 1 Dura Mater Literally means quottough motherquot in Latin It is a tough sheath made of dense irregular connective tissue 0 Dural Sheath o Epidural Space Above the dura o Subdural Space 2Arachnoid Mater 0 Subarachnoid Space Contains cerebral spinal uid 3 Pia Mater Most inner membrane of the brain and spinal cord Types of Nervous Tissue Gray Matter 0 Found in the Central Nervous System 0 Contains small amounts of myelin 0 Has somas dendrites and proximal axons White Matter 0 Myelinated axons and bundles of axons tracts o No somas Gray Matter Structures 0 Dorsal horn o Ventral horn 0 Gray commissure 0 Central canal 0 Lateral horn White Matter Structures 0 Surrounds the gray matter in columns or Funniculi o Dorsal lateral and ventral Spinal Nerves Numerous nerve bers bound by connective tissue 0 31 pairs 0 Has a dorsal root ganglion has a bump on it 0 Has proximal and distal branches Spinal nerves come out of intervertebral foramen Dorsal Root Ganglia 0 Has sensory neurons go towards the brain 0 Motor neurons go away from the brain 0 Ganglia Somas outside of the nervous system Dermatome Diagram of the cutaneous regions innervated by each spinal nerve Nerve Plexuses Nerves that join together Cervical Plexus Phrenic nerve innervates the diaphragm s stringy and near the heart Brachial Plexus Contains 0 Musculocutaneous Nerve o Axillary Nerve o Ulnar Nerve 0 Median Nerve 0 Radial Nerve Lumbar Plexus Femoral nerve Is a yellow structure Sacral Plexus Comes out of sacral foramen Main nerve is the sciatic nerve Re ex Quick involuntary reaction of the muscles or glands Re ex Arc Contains somatic receptors afferent nerve bers and an integrating center
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