BRAIN The brain is a large organ which lies in the cranial cavity. The average weight of brain is 1.4 kg. It is divided in 4 parts: cerebrum, brain stem, diencephalon and cerebellum. CEREBRUM Cerebrum is the largest part of […]
CRANIAL NERVES There are 12 pairs of cranial nerves which originate from the nuclei in the inferior surface of the brain, out of which some are sensory some are motor nerves and the remaining one are the mixed nerves that […]
There are 31 pairs of spinal nerves that leave the vertebral column through the intervertebral foramina. These foramina are formed by the adjacent vertebrae. These nerves are named according to the vertebral region with which they are associated; that is: […]
The peripheral nervous system consist of 3 parts- 31 pairs of spinal nerves 12 pairs of cranial nerves autonomic nervous system Autonomic Nervous System ANS is a involuntary part of nervous system and controls involuntary body activities. Stimulation of ANS […]
The spinal cord is a long cylindrical portion of the central nervous system. It is suspended in the vertebral column and is enclosed by the meninges and cerebrospinal fluid. The spinal cord is continuous with the medulla oblongata and extends […]
AXIAL SKELETON: Hyoid Bone It is a unique part of axial skeleton, as this bone does not articulate with any other bone. It is located in the anterior neck just between the mandible and larynx. The hyoid bone keeps the […]
Transport of material across the plasma membrane of cell is essential for life of a cell. Certain substances must move into the cell for metabolic activities; while some substances which are produced by the cell or are waste products should […]
Axial Skeleton System There are 22 bones of skull. They lie on the superior end of vertebral column. These bones are divided in 2 groups: Cranial bones- which forms the cranial cavity are eight in number; Facial bones- these are […]