Aidan
PS1005
Provide an overview of the principal structures of the midbrain, hindbrain and forebrain and their functions.
The human nervous system consists of many structures. We distinguish between the central- and the peripheral nervous system. The two major subdivisions of the central nervous system are the brain and the spinal cord, which is found in the spinal column. The peripheral nervous system consists of the nerves outside the brain and the spinal cord.
The spinal cord communicates with all the sense organs and muscles except those of the head. It is compromised of grey matter which is densely packed with cell bodies and dendrites and white matter which consists mostly of myelinated axons. According to the Bell-Magendie law, the entering dorsal roots carry sensory information and the exiting ventral roots carry motor information. Each segment sends sensory information to the brain and receives motor commands from the brain.
The brain is the center of the nervous system and can be divided into three major subdivisions: Forebrain, Midbrain and Hindbrain. The number of neurons in the brain is estimated to range between 80 120 billion. The purpose of this essay is to explain and analyse the three major subdivisions of the brain and their functions.
The hindbrain, the posterior part of the brain, consists of the medulla, the pons and the cerebellum. The brainstem is constituted by certain central structures of the forebrain and by the medulla, pons and mitdbrain.
The medulla could be regarded as an enlarged extension of the spinal cord but located in the skull. It controls vital reflexes such as breathing, vomiting, sneezing, coughing and heart rate. The reflexes are controlled through the cranial nerves wh67ich control sensations from the head, muscle movements in the head, and much of the parasympathetic output to the organs. Damage to the medulla is frequently fatal and doses of opiates are life-threatening as they suppress activity of the
Provide an overview of the principal structures of the midbrain, hindbrain and forebrain and their functions.
The human nervous system consists of many structures. We distinguish between the central- and the peripheral nervous system. The two major subdivisions of the central nervous system are the brain and the spinal cord, which is found in the spinal column. The peripheral nervous system consists of the nerves outside the brain and the spinal cord.
The spinal cord communicates with all the sense organs and muscles except those of the head. It is compromised of grey matter which is densely packed with cell bodies and dendrites and white matter which consists mostly of myelinated axons. According to the Bell-Magendie law, the entering dorsal roots carry sensory information and the exiting ventral roots carry motor information. Each segment sends sensory information to the brain and receives motor commands from the brain.
The brain is the center of the nervous system and can be divided into three major subdivisions: Forebrain, Midbrain and Hindbrain. The number of neurons in the brain is estimated to range between 80 120 billion. The purpose of this essay is to explain and analyse the three major subdivisions of the brain and their functions.
The hindbrain, the posterior part of the brain, consists of the medulla, the pons and the cerebellum. The brainstem is constituted by certain central structures of the forebrain and by the medulla, pons and mitdbrain.
The medulla could be regarded as an enlarged extension of the spinal cord but located in the skull. It controls vital reflexes such as breathing, vomiting, sneezing, coughing and heart rate. The reflexes are controlled through the cranial nerves wh67ich control sensations from the head, muscle movements in the head, and much of the parasympathetic output to the organs. Damage to the medulla is frequently fatal and doses of opiates are life-threatening as they suppress activity of the