sulcus

Examples of sulcus in the following topics:

• Development of Vision

  • Development of the optic vesicles starts in the three week embryo from a progressively deepening groove in the neural plate called the optic sulcus.
  • As this expands, the rostral neuropore (the exit of the brain cavity out of the embryo) closes and the optic sulcus and the neural plate becomes the optic vesicle.

• Sensory Areas

  • The primary somatosensory cortex is across the central sulcus and behind the primary motor cortex configured to generally correspond with the arrangement of nearby motor cells related to specific body parts.
  • The visual area is located on the calcarine sulcus deep within the inside folds of the occipital lobe.

• Cerebral Cortex

  • One notable sulcus is the central sulcus, or the wrinkle dividing the parietal lobe from the frontal lobe.

• Hypoglossal (XII) Nerve

  • The hypoglossal nerve emerges from the medulla oblongata in the preolivary sulcus where it separates the olive (olivary body) and the pyramid (medullary pyramid).

• Humerus (The Upper Arm)

  • Between the two tubercles lies a deep grove termed the intertubercular sulcus through which the tendon of the long head of the biceps brachii runs.

• Cerebral Lobes

  • It is separated from the parietal lobe by a space between tissues called the central sulcus; it is separated from the temporal lobe by a deep fold called the lateral (Sylvian) sulcus.

• Brain: Cerebral Cortex and Brain Lobes

  • The outermost part of the brain is a thick piece of nervous system tissue called the cerebral cortex, which is folded into hills called gyri (singular: gyrus) and valleys called sulci (singular: sulcus).
  • The cortex is composed of two hemispheres, right and left, which are separated by a large sulcus.

• The Brain

  • Anatomists call each cortical fold a sulcus, and the smooth area between folds a gyrus.
  • There is one exception: the border between the frontal and parietal lobes is shifted backward from the corresponding suture, to the central sulcus, a deep fold that marks the line where the primary somatosensory cortex (main sensory receptive area for the sense of touch) and primary motor cortex (one of the principal areas of the brain involved in motor function) come together.

• Introduction to Sensation

  • The toes are represented at the top of the cerebral hemisphere, while the mouth is represented at the bottom of the hemisphere, closer to the part of the brain known as the lateral sulcus.
  • These representations lie along a fold in the cortex called the central sulcus.

• Overview of the Cerebrum

  • The cortex is composed of two hemispheres, right and left, which are separated by a large sulcus.