First Aid for the Basic Sciences by Tao Le & Kendall Krause & Elizabeth Eby Halvorson & William L. Hwang

Author:Tao Le & Kendall Krause & Elizabeth Eby Halvorson & William L. Hwang
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2012-04-14T16:00:00+00:00

FIGURE 6-22. Axial cut of the brain through the internal capsule. Notice that descending motor fibers for the face, arm, and leg (F, A, and L) run anterior to the ascending sensory fibers (f, a, and l) in the posterior limb of the internal capsule.

DIVISIONS

Anterior limb, posterior limb, genu (the bend between the anterior and posterior limbs), retrolenticular limb, and sublenticular limb.

Anterior limb: Frontopontine fibers (between frontal cortex and pons), thalamocortical fibers (between medial/anterior nuclei of thalamus and frontal lobes).

Posterior limb: Descending corticospinal tract, ascending sensory fibers (medial lemniscus, anterolateral/spinothalamic tract).

Genu (the bend or “elbow”): Descending corticobulbar tract (between cortex and brain stem).

Retrolenticular limb: Optic radiation (between lateral geniculate nucleus and primary visual cortex).

Sublenticular limb: Auditory radiation (between medial geniculate nucleus and primary auditory cortex).

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