CNS-8 Brain Stem( Mid brain)

Views:
 
Category: Education
     
 

Presentation Description

No description available.

Comments

Presentation Transcript

Brain Stem:

Brain Stem Husan Bano Associate Professor Department of Physiology Al- Tibri Medical College, Isrr University

Brain Stem:

Brain Stem Brian stem is consist of: Mid-brain Pons Medulla oblongata

Mid- brain:

Mid- brain Mid-brain is the smallest and least differentiated part of the brain stem. It lies between the pons and thalamus, having length of about 1.5 cm. A cerebral eqviduct passes through mid brain.

Slide 4:

Cerebral equiduct

Mid- brain:

Mid- brain Mid brain consist of : Tectum Cerebral peduncles

1. Tectum:

1. Tectum Tectum is the collection of nerve cell which lies dorsal to cerebral equiduct . It is presented by: Superior colliculi . Inferior colliculi . Nuclei of 3 rd . And 4 th . Cranial nerves.

Tectum:

Tectum Superior colliculi carrying the visual impulses towards the occipital lobe . Inferior colliculi carrying auditory impulses toward the temporal lobe.

2. Cerebral peduncle:

2. Cerebral peduncle Cerebral peduncle lies ventral to cercbral equiduct . Cerebral peduncle divided into two areas i.e ventral and dorsal by presence of melanin containing nerve cells called substantia nigra .

2. Cerebral peduncle:

2. Cerebral peduncle Tegmentum Substantia nigra Crura cerebri

Red nucleus:

Red nucleus Laterally and below the cerebral equi -duct “ “red nucleus ” is present .

Functions of Mid Brain:

Functions of Mid Brain

Functions of Mid Brain:

Functions of Mid Brain Peduncles of mid brain serve as “ motor relay station ” in between cerebellum and spinal cord. Superior colliculi carrying visual impulses ` into occipital lobe. Inferior colliculi carrying auditory impulses into temporal lobe.

Functions of Mid Brain:

Functions of Mid Brain Reflexes that maintain body orientation to its environment by visual and auditory impulses are also controlled by the mid- brain. These are called “ righting reflex ”

authorStream Live Help