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Medical illustration of the posterior longitudinal ligament of the spinal column, posterior dorsolateral view (A) and cutaway view showing paths taken (arrows) in disk prolapse (B). Structures labeled include the vertebral (spinal) foramen, intervertebral foramen, nucleus pulposus, and annulus fibrosus.
Medical illustration of the posterior longitudinal ligament of the spinal column, posterior dorsolateral view (left) and cutaway view showing paths taken (arrows) in disk prolapse (right). Structures shown include the vertebral (spinal) foramen, intervertebral foramen, nucleus pulposus, and annulus fibrosus.
Medical illustration showing the mechanism of gamma motor neuron function in skeletal muscle, showing (A) resting extrafusal and intrafusal fibers, (B) extrafusal contraction, and (C) intrafusal response. Structures shown include the alpha efferent, gamma efferent, and group Ia afferent.
Medical illustration of a muscle spindle and its associated structures. Shown are the spindle in the first dorsal interosseus muscle of the hand (left) and muscle spindle location and anatomy (right), with labels for the connective tissue capsule, intrafusal and extrafusal muscle fibers, and sensory neurons.
Medical illustration of a muscle spindle and its associated structures. Shown are the spindle in the first dorsal interosseus muscle of the hand (left) and muscle spindle location and anatomy (right), with structures including the connective tissue capsule, intrafusal and extrafusal muscle fibers, and sensory neurons.