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4 days ago · In many brain fibers, particularly those in the white matter, these axons are wrapped in a protective sheath called myelin. This myelin is produced by specialized cells called oligodendrocytes, which are part of a larger family of support cells in the nervous system known as glial cells.
Jan 7, 2021 · They consist of specialized muscle fibers (so called intrafusal fibers) that are multiply innervated and named according to the arrangement of their nuclei as nuclear bag or nuclear chain fibers (a schematic representation of a muscle spindle is shown in Fig. 1 a).
- Stephan Kröger, Bridgette Watkins
- 10.1186/s13395-020-00258-x
- 2021
- Skelet Muscle. 2021; 11: 3.
Jul 24, 2023 · Six extrinsic eye muscles that move each eye: (1) superior rectus, (2) inferior rectus, (3) lateral rectus, (4) medial rectus, (5) superior oblique, and (6) inferior oblique. Lateral rectus is innervated by trochlear and superior oblique is innervated by abducens nerve; The oculomotor nerve innervates the remaining four muscles.
- Ibraheem Rehman, Bita Hazhirkarzar, Bhupendra C. Patel
- 2023/07/24
- 2019
The large majority of muscle fibers that allow the muscle to do work are termed extrafusal fibers. Each muscle contains many muscle spindles; muscles that are necessary for fine movements contain more spindles than muscles that are used for posture or coarse movements.
Mar 17, 2023 · They are classified into two main groups: protoplasmic and fibrous.
- Kenia A. Maldonado, Khalid Alsayouri
- 2023/03/17
- Burke Rehabilitation Hospital, Mayo Clinic
Oct 30, 2023 · A motor neuron and its associated muscle fibers make up a motor unit. Fine muscles (e.g. extraocular muscles) have small motor units and therefore can be controlled more precisely in comparison to larger muscles (e.g. biceps brachii).
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Oct 30, 2023 · The hypoglossal nerve carries somatic sensory efferent fibers which innervate all of the intrinsic muscles and the majority of extrinsic muscles of the tongue, including the hyoglossus, styloglossus, and genioglossus muscles. The only tongue muscle not innervated by the hypoglossal nerve is palatoglossus, which is innervated by the vagus nerve.
