GENERAL HISTOLOGY

Detailed explanation-1: -The motor cortex comprises three different areas of the frontal lobe, immediately anterior to the central sulcus. These areas are the primary motor cortex (Brodmann’s area 4), the premotor cortex, and the supplementary motor area (Figure 3.1).

Detailed explanation-2: -The cerebral cortex contains three types of functional areas: motor areas, sensory areas, and association areas. Motor areas control motor activities, while sensory areas receive sensory information through afferent fibers via thalamic nuclei.

Detailed explanation-3: -The most intensively studied motor areas, the premotor area (PMA), supplementary motor area (SMA), and primary motor cortex (MI), appear to have different roles in movement. PMA is involved in coupling arbitrary cues to motor acts, whereas SMA appears to participate more in internal guidance or planning of movement.

Detailed explanation-4: -The primary motor cortex, Brodmann’s area 4, is an obvious starting point. It sends direct projections to the spinal cord and is unique among cortical areas in that it possesses reciprocal connections with all of the premotor regions that project to the spinal cord.