Skeletal system - cranium, Biology


  1. Large, hollow, rounded part of the skull.
  2. It's cavity is cranial cavity in it brain is protected. Such animals in which cranium present grouped in craniata.
  3. Cranium is formed of 8 flattened bones 1 frontal, 2 parital, 1 occipital, 2 temporals, 1 sphenoid and 1 ethmoid.
  4. The cranial bones fit together by wavy, immovable boundries called sutures.
  5. Pariatals are demrcated from the frontal by a coronal suture, from the occipital by lambdoidal suture and from the temporals by lateral sutures.
  6. A large hole called foramen magnum present from which brain comes out in the form of spinal cord.
  7. At the base of cranium 2 occipital condyles present attached to atals vertebrae forming a hinge joint that permits nodding of the head so skull is dicondylic.
  8. On either side of the cranium is an auditory capsule that contains 3 small bones called malleus, incus & stapes (helpful in hearing), stapes is smallest bone.
  9. So total 14 bones present in cranium & ear osicles.

2038_human skull.png


Posted Date: 10/2/2012 8:20:31 AM | Location : United States

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