The Neuroscience on the Web Series: The Frontal Lobe is the most anterior lobe of the brain. Its posterior boundary is the fissure of Rolando, or central sulcus, which separates it from the parietal lobe. Inferiorly, it is divided from the temporal lobe by the fissure of Sylvius which is also called the lateral fissure.
Premotor cortex - Wikipedia
Alternative maps[ edit ] Map of the body in the human brain At least two modifications to the classical somatotopic ordering of body parts have been reported in the primary motor cortex of primates. First, the arm representation may be organized in a core and surround manner. In the monkey cortex, the digits of the hand are represented in a core area at the posterior edge of the primary motor cortex. This core area is surrounded on three sides on the dorsal, anterior, and ventral sides by a representation of the more proximal parts of the arm including the elbow and shoulder. One representation lies in a posterior region called area 4p, and the other lies in an anterior region called area 4a. The posterior area can be activated by attention without any sensory feedback and has been suggested to be important for initiation of movements, while the anterior area is dependent on sensory feedback.
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Precentral gyrus[ edit ] The precentral gyrus lies in front of the postcentral gyrus - mostly on the lateral convex side of each cerebral hemisphere - from which it is separated by the central sulcus. Its anterior border is represented by the precentral sulcus , while inferiorly it borders to the lateral fissure Sylvian fissure. Medially , it is contiguous with the paracentral lobule. The internal pyramidal layer layer V of the precentral cortex contains giant micrometers pyramidal neurons a. Betz cells , which send long axons to the contralateral motor nuclei of the cranial nerves and to the lower motor neurons in the ventral horn of the spinal cord.