ANAT 2646 Class Notes - Cerebral Cortex More than of the...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Cerebral Cortex More than of the cortex is hidden within the sulcus 2-4mm thick Stucture: o Laminar (3-6 layers) anatomic organization Archecortex (oldest) covers temporal and limbic lobe 3 layers Neocortex (newest) 6 layers o Columnar (modules of cortex) functional organization so, functional organization organized in columns Cell Types Pyramidal excite (triangular) o Betz cell big Pyramidal Spiny stellate excite (rough, star-shaped) Smooth stellate inhibit Bipolar excite or inhibit Lamina (aka. Layers) Molecular mostly fibers and few neurons; outer-most layer Outer granule small pyramidal, some stellate, cells are small, look like grains when stained Outer pyramidal more stellate Inner granule more stellate Inner pyramidal bigger pyramidal (aka. Betz cells) Fusiform bipolar, spindly shaped cells; inner-most layer Staining Golgi silver Nissl stains ribosomes; useful in showing accumulation of cell structures Weigert stains myelinated cell fibers; shows columnar organization Cortical Fibers Projectional (corticospinal) from cortex to spinal cord; they project outwards (towards the spinal cord) Commissural joins the two hemisphere; ex: corpus callosum Associational stay within the same hemisphere; 2 forms: o Short: stay within the same lobe. Ie. Gyrus to gyrus o Long: from one lobe to another lobe. Ie. Temporal to frontal lobe Association Fibers From one part to another within a single hemisphere o Short: from one gyrus to another within a lobe o Long: from one lobe to another o Superior longitudinal fasciculus o Inferior longitudinal fasciculus o Arcuate generic term that names any fibers that arches o Uncinate located near the uncus o Cingulum Commissural Fibers From one hemisphere to the other o Corpus callosum o Anterior commissure o Posterior commissure o ? Afferents Association - toward Commissural toward Thalamocortical (specific) ascending Thalamocortical (non-specific) Neuroaxial anywhere outside the cortex. Ie. Spinal cortex, medulla cortex Efferent Fibers Association (small pyramidal) Commissural (medium pyramidal) Projection (large pyramidal) Sensory Areas Somatic Sensory Cortex (1, 2, 3) Supplementary Sensory (5) Visual ( 17 , 18, 19); 17 is primary visual cortex; 18, 19 are Visual associational areas Auditory ( 41,42 , 22); 41, 42 are transverse temporal gyri; 22 is an auditory associational area Motor Areas 1) Primary Motor field (4) o Premotor (6) o Supplemental Motor (6) 2) Primary eye field (8) eye movements 3) Prefrontal area thinking, decision making, social behavior Asymmetries Handedness Brocas Area (44, 45) speech area; may have problems with Wenicke if this area is affected Wernickes Area (22) expressive speech Angular gyrus (39) may have problems with Wenicke if this area is affected...
View Full Document

Page1 / 13

ANAT 2646 Class Notes - Cerebral Cortex More than of the...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online