To discuss:
The locations and differences between the upper and lower motor neurons in the descending tracts.
Introduction:
The spinal cord is a collection of nerve tissue that arises from the brain stem. It is a site that contains many motor neurons, interneurons, and complex neural circuits. The spinal cord tracts are stimulatory nerve pathways that pass the information through action potentials. The spinal tracts are important to diagnose and manage the spinal cord damages or injuries. It consists of two kinds of tracts namely ascending tracts (carry sensory information up the cord) and descending tracts (conduct motor impulses down the spinal cord and the brain).
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Chapter 13 Solutions
LSC (CONCORDIA UNIV ST PAUL) BIO 315/316: B&N DPF Connect with APR and Phils Online Access for Anatomy and Physiology: The Unity of Form and Function 180 Day Access ENTRP
- Item 16 The tectospinal tract is part of the medial pathway, which is an indirect motor pathway. True or False.arrow_forwardWhat clinical disorder results from a deficiency of the neurotransmitter substance associated with melanin pigment in the substantia nigraarrow_forwardOn a sagittal plane, the cerebellar white matter exhibits a branching pattern called the _____________.arrow_forward
- Locations of the gray and white matter in the cerebrum and cerebellum; the composition of gray and white matter and how this relates to their colors; and the meaning of cortex, nucleus, and tract in relation to brain gray and white matterarrow_forwardThe shape of the cell bodies of upper and lower motor neurons are structurally classified as blank and blank, respectivelyarrow_forwardRadial nerve (easily viewed in the proximal posterior arm between long and lateral heads of triceps brachii) Â The radial nerve innervates the: brachioradialis, extensor carpi radialis longus and brevis, extensor carpi ulnaris, extensor digitorum, extensor digiti minimi, abductor pollicis longus, extensor pollicis longus and brevis, and extensor indicis. What is the name of the muscle compartment that houses most of these muscles? ____________________.arrow_forward
- How autonomic efferent pathways differ from somatic efferent pathways; the meanings of preganglionic and postganglionic fibers .arrow_forwardHow one action potential triggers another; how the continuous conduction seen in unmyelinated nerve fibers result from a chain reaction of action potentials; and what normally prevents the signal from traveling backward to the neurosoma.arrow_forwardThe particular glial cells that engulf cellular debris and trigger inflammation aremicroglia.Schwann cells.astrocytes.oligodendrocytes.oligodendroglia.arrow_forward