Presentation is loading. Please wait.

Presentation is loading. Please wait.

The Nervous System - Lab Exercise 5

Similar presentations

Presentation on theme: "The Nervous System - Lab Exercise 5"— Presentation transcript:

1 The Nervous System - Lab Exercise 5

2 Divisions of the Nervous System
Central nervous system (CNS) – brain & spinal cord Peripheral nervous system (PNS) – cranial nerves & spinal nerves

3 The Central Nervous System
CNS well protected by bones (cranial & vertebrae), CT meninges, & cerebrospinal fluid (CSF) Meninges – Connective tissues that surround and protect the brain and spinal cord (CNS) 3 layers: Dura Mater Arachnoid Pia Mater

4 Meninges Dura Mater – tough, fibrous outer layer
2 layers thick around brain with creation of dural sinuses between layers; 1 layer around spinal cord with epidural space external

5 Meninges Arachnoid – “spidery” web-like middle layer
Pia Mater – delicate, thin inner layer; adhered to brain & cord; extension of pia mater (“filum terminale”) extends from tip of cord to coccyx to anchor cord in place Subarachnoid space – between arachnoid & pia mater; contains cerebral spinal fluid (CSF)

6 Superior sagittal sinus
Dura mater (gray color) Arachnoid (orange color) Subarachnoid space (blue color) Pia mater (red color)

7 The Brain Brain stem medulla oblongata (M.O.) pons midbrain
Diencephalon thalamus hypothalamus mamillary bodies epithalamus (pineal gland) Cerebrum Cerebellum Cerebrum T P P H midbrain M Cerebellum pons m.o.

8 Cerebrum T P H midbrain M pons Cerebellum m.o Spinal cord

9 The Brainstem medulla oblongata (M.O.) pons midbrain –
cerebral peduncle cerebral aqueduct of midbrain corpora quadrigemina superior colliculi inferior colliculi pons Cerebral peduncle m.o. Cerebral aqueduct of midbrain

10 Cerebral aqueduct of midbrain
Superior colliculus Inferior colliculus Cerebral peduncle

11 The Diencephalon thalamus intermediate mass hypothalamus
mamillary bodies connects to pituitary gland via infundibulum epithalamus (pineal gland) T Intermediate mass of thalamus P H infundibulum Pituitary gland M


13 Cerebrum convolutions
gyrus sulcus 4 lobes per hemisphere- frontal, parietal, temporal, occipital

14 The Cerebrum corpus callosum fornix septum pellucidum

15 The Cerebellum gray matter “folia” white matter “arbor vitae”
separated from cerebrum by transverse fissure Transverse fissure


17 Cerebrospinal Fluid (CSF)
clear, colorless fluid formed by filtration of blood plasma by choroid plexuses within ventricles of the brain. functions in protection of CNS, support, nutrient supply, waste removal


19 CSF Circulation Lateral ventricles (in cerebral hemispheres)  interventricular foramen  third ventricle (in diencephalon around thalamus)  cerebral aqueduct of midbrain  fourth ventricle (between pons/cerebellum)  subarachnoid space & central canal of SC Lateral ventricle (behind septum pellucidum) Third ventricle Aqueduct of midbrain Fourth ventricle

20 Reabsorption of CSF through arachnoid granulations (arachnoid villi) of dural sinuses (superior sagittal sinus)  into cerebral veins

21 Superior sagittal sinus
Arachnoid granulation (villus)

22 Cranial Nerves 12 pairs of nerves that connect to the brain; provide motor, sensory &/or autonomic (parasympathetic) function

23 I (olfactory bulb) Olfactory tract Optic chiasm Optic tract II III IV V VII VI VIII IX XII X XI

Download ppt "The Nervous System - Lab Exercise 5"

Similar presentations

Ads by Google