BIO 12D Lecture Notes - Lecture 23: Axon Terminal, T-Tubule, Collagen
16 Aug 2020
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Document Summary
Somatic motor pathways control skeletal muscles and are different form autonomic pathways. Have a single neuron that originates in the cns and projects its axon to the target tissue locatedin the skeletal muscle. A somatic motor pathway consists of one neuron. The cell bodies are located in the ventral horn of the spinal cord or the brain with a long single axon projecting to the skeletal muscle target. Branch close to their targets with each branch divided into a cluster of enlarged axon terminals. This allows a single motor neuron to control many muscle bers at one time. Neuromuscular junction: the synapse of a somatic motor neuron on a muscle ber; Presynaptic axon terminal lled with synaptic vesicles and mitochondria. The postsynaptic side of the neuromuscular junction has a muscle cell membrane that is modi ed into a motor end plate. Between the axon and the muscle, the synaptic cleft is lled with a.
