Chapter 4 Anatomy of the Nervous System Flashcards
Name the 2 parts of the PERIPHERAL Nervous System
Somatic Nervous System and Autonomic Nervous System
Name the 2 parts of the AUTONOMIC Nervous System
Sympathetic Nervous System and Parasympathetic Nervous System
The brain and the spinal cord
The Central Nervous System (CNS)
Connects the brain and spinal cord to the rest of the body. Consists of 2 somatic nervous system and autonomic nervous system.
The Peripheral Nervous System
Part of the PNS is the ________, which consists of the axons conveying messages from the sense organs to the CNS and from the CNS to the muscles
Somatic Nervous System
Another part in the PNS, is the ___________ which controls the heart, intestines, and other organs, it has some of its cell bodies within the brain and spinal cord and some in clusters along the sides of the spinal cord.
Autonomic Nervous System
means toward the back, in animals the top of the brain is the ______. Sensory nerves enter through here.
Dorsal
means towards the stomach, in animals the bottom of the brain is the _______ (on the stomach side). Carry Motor Information.
Ventral
the part of the CNS within the spinal column; it communicates with all the sense organs and muscles except those of the head.
Spinal Cord
One of the first discoveries about functions of the nervous system, the entering dorsal roots (axon bundles) carries sensory information, and the exiting ventral roots carry motor information.
Bell-Magendie Law
The cell bodies of the sensory neurons are in clusters of neurons outside the spinal cord referred to as ________.
In most cases, a neuron cluster outside the CNS is called ganglion and a cluster inside the CNS is call a nucleus.
Dorsal Root Ganglia
• H-Shaped _____ in the center of the spinal cord is densely packed with cell bodies and dendrites. Many neurons of the spinal cord send axons from the _______to the brain or other parts of the spinal cord through the White Matter which consists mostly of myelinated axons that carries information from the gray matter to the brain or other areas of the spinal cord.
Gray Matter
a network of nerves that prepare the organs for vigorous activity, consists of chains of ganglia just to the left and right of the spinal cords central regions. __________ axons prepare the organs for “flight or fight” increasing breathing and heart and decreasing digestive activity
Sympathetic Nervous System
facilitates vegetative, nonemergency responses. Does the exact opposite of the sympathetic nervous system, for example instead of increasing the heart rate the parasympathetic decreases it. Also known as the Craniosacral System because it consists of the cranial nerves and nerves from the sacra; spinal cord.
Parasympathetic Nervous System
the posterior part of the brain, consists of the medulla, the pons, and the cerebellum.
Hindbrain
The medulla and pons, the midbrain. And certain central structures of the forebrain constitute the _______
Brainstem
is just above the spinal cord and can be regarded as an enlarged extension of the spinal cord into the skull. The _____ controls vital reflexes including breathing, heart rate, vomiting, coughing, sneezing, and salivation
Medulla
lies anterior and ventral to the medulla; it contains nuclei for several cranial nerves. In the __, axons from each half of the brain cross to the opposite side of the spinal cord so that the left hemisphere controls the muscles of the right side of the cell body and the right hemisphere controls the left side.
Pons
has descending and ascending portions; the descending portion is one of several bran areas that control the motor areas of the spinal cord. The ascending portion sends output to much of the cerebral cortex.
Reticular Formation
sends axons to much of the forebrain, modifying the brains readiness to respond to stimuli.
Raphe System
a large hindbrain structure with many deep folds, known for its contribution to the control of movement and has been described as important for balance and coordination.
Cerebellum
the middle of the brain, although in adult mammals is dwarfed and surrounded by the forebrain
Midbrain