Bio 253 Exam 2 Graded A+

Bio 253 Exam 2 Graded A+ Dorsal root has what kind of fibers Sensory Fibers (afferent) Venerate Root has what kind of fibers motor fibers (efferent) Significance of the phrenic nerve it's housed in the cervical plexus innervates the diaphragm Which plexus houses the ulnar Brachial plexus The ramus is large branches formed after each spinal nerve emerges from the spinal cavity. The dorsal ramus supplies somatic motor and sensory fibers to smaller nerves that innervate the muscles and skin of the posterior surface of the head, neck, and trunk. Dermatome Region of the skin surface area supplied by afferent (sensory) fibers of a given spinal nerve Myotomes movement Skeletal muscle or muscles supplied by efferent (motor) fibers of a given spinal nerve How many cranial nerves are responsible for eye movement and what are they 3 they are Cranial Nerves III, IV, and VI (3,4,6) cranial nerves Oh Olfactory SENSORY Oh Optic SENSORY Oh Oculomotor MOTOR To Trochlear MOTOR Touch Trigeminal MIXED And Abducens MOTOR Feel Facial MIXED Very Vestibulocochlear SENSORY Good Glossopharyngeal MIXED Vagina's Vagus MIXED and Accessory MOTOR Hymen Hypoglossal MOTOR page:489 21-2 What do cranial nerves contain contains axons of sensory and motor neurons Afferent Afferent neurons are sensory neurons that carry nerve impulses from sensory stimuli towards the central nervous system and brain Efferent are motor neurons that carry neural impulses away from the central nervous systme and towards muscles to cause movement. Reflex Arc the nerve pathway involved in a reflex action including at its simplest a sensory nerve and a motor nerve with a synapse between. The somatic motor system includes all the __ motor pathways __ the CNS. voluntary; outside The dorsal root of each spinal nerve is easily recognized by a swelling called the dorsal root ganglion. Each skin surface area supplied by sensory fibers of a given spinal nerve is a dermatome How many pairs of spinal nerves are connected to the spinal cord? 31 The lower end of the spinal cord, with its attached spinal nerve roots, gives the appear