phys4a - Lecture 4 11 Lecture 4 Lecture 4 Anatomy of the...

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Unformatted text preview: Lecture 4 11 Lecture 4 Lecture 4 Anatomy of the Nervous System & Methods of Investigation 2 Lecture 4 Basic Subdivisions of the Basic Subdivisions of the Vertebrate Nervous System Vertebrate Nervous System Terminology Iconic Naming Direction: relative to the neuraxis anterior -- posterior rostral -- caudal dorsal -- ventral superior -- inferior lateral -- medial ipsilateral -- contralateral 3 Lecture 4 Anatomical Terms for Direction Anatomical Terms for Direction 4 Lecture 4 Basic Subdivisons of the NS cont Basic Subdivisons of the NS cont Terminology (cont) Planes of Section horizontal sagital transverse / frontal / coronal Meninges Protective membranes covering the brain & s.c. dura mater = outermost arachnoid = middle pia mater = innermost 5 Lecture 4 Brain & Skull (Meninges) Brain & Skull (Meninges) 6 Lecture 4 Basic Subdivisions of the NS cont Basic Subdivisions of the NS cont Blood Supply of the Human Brain Fuel for brain = oxygen & glucose via carotid & vertebral arteries Route of blood supply common carotid arteries internal carotids vertebral arteries basilar carotids & basilar arteries join anterior middle cerebral arteries artery Circle of Willis 7 Lecture 4 Blood Supply of the Brain 8 Lecture 4 Basic Subdivisions of the NS cont Basic Subdivisions of the NS cont Ventricular System of the Brain Filled with cerebrospinal fluid (CSF) 4 ventricles lateral ventricles (2) ie one on each side of the brain 3rd ventricle (diencephalon) 4th ventricle (metencephalon) Two functions: act as a shock absorber or cushion mediate between blood vessels & brain tissue in exchange of materials 9 Lecture 4 Basic Subdivisions of the NS cont Basic Subdivisions of the NS cont Peripheral Nervous System (PNS) Tract = collection of axons in CNS Nerve = collection of axons in PNS Cranial nerves: 12 pairs (mnemonic device) On Old Olympus Towering Tops, A Frenchman And German Viewed Alpine Hops Spinal nerves: 31 pairs cervical -- 8 thoracic -- 12 lumbar -- 5 sacral -- 5 coccygeal -- 1 10 Lecture 4 Human Central Nervous System 11 Lecture 4 Basic Subdivisions of the NS cont Basic Subdivisions of the NS cont PNS (cont) Dermatome: skin area innervated by a sensory spinal nerve Spinal cord center: H-shaped grey matter, densely packed with cell bodies & dendrites, with few myelinated axons periphery: white matter, myelinated axons dorsal = sensory; ventral = motor 12 Lecture 4 Spinal Cord Cross Section 13 Lecture 4 Basic Subdivisions of the NS cont Basic Subdivisions of the NS cont The Nervous System CNS PNS Brain Spinal Cord Autonomic Somatic Sympathetic Parasympathetic 14...
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This note was uploaded on 05/02/2011 for the course PHYS 100 taught by Professor Balassare during the Fall '10 term at Saint Louis.

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phys4a - Lecture 4 11 Lecture 4 Lecture 4 Anatomy of the...

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