Chapter 13 - My L&M Flashcards
What two nerves do not arise from the brain stem?
Olfactory and optic
The ______________ of the peripheral nervous sytems consists of lower motor neurons that directly innervate skeletal muscle fibers.
Somatic motor division
What nerve is unique in that it has a spinal origin?
Accessory
Which nerve innervates most of the intrinsic and extrinsic muscles of the tongue?
Hypoglossal
Which cranial nerve originates as two separate nerves that share a common epineurium, but fuse together after they leave the temporal bone?
Vestibulocochlear
Which is not a primary function of the oculomotor nerve (III)?
Dilates the pupil
Where does the motor portion of the facial nerve (VII) originate?
Nuclei in the pons and medulla
Which of the cranial nerves contain axons of motor neurons?
Trochlear
Which division detects stimuli of the general senses and special senses?
Somatic sensory division
Which cranial nerves are generally thought of as mixed?
Trigeminal, facial, glossopharyngeal, and vagus
Which cranial nerves are generally thought of as sensory?
Olfactory, optic, and vestibulocochlear
Which cranial nerves are generally thought of as motor?
Oculomotor, Trochlear, abducens, accessory, and hypoglossal
Which nerve has the sensory functions of taste in the posterior one-third of the tongue and detecting changes in blood pressure of the carotid artery?
Glossopharangeal
What connects the upper motor neurons to lower motor neurons?
Interneurons
What connective tissue sheath wraps the axon of a neuron?
Endoneurium
Bell’s palsy affects the __________ nerve.
Facial
The ________ innervates the throat, anterior neck, and almost all of the thoracic and abdominal viscera.
Vagus
Which somatic motor neuron innervates the lateral rectus muscle?
Abducens
What is the connective tissue sheath that surrounds a peripheral nerve?
Epineurium
What extraocular muscle does the trochlear nerve (IV) innervate?
Superior oblique muscle
What nerve stimulates the masseter and temporalis muscles to elevate the mandible during mastication and swallowing?
Trigeminal
What nerve causes the painful tingling sensation when you hit your “funny bone”?
Ulnar nerve
Merkel cell fibers, tactile corpuscles, Ruffini endings, and lamellated corpuscles are all types of ______________.
Mechanoreceptors
What sensors are located in the musculoskeletal system and detect the movement and position of a joint or body part?
Proprioceptors
The _________ nerve is the largest nerve from the posterior division, and of the lumbar plexus.
Femoral
____________ detect an object’s texture, temperature, and color.
Exteroceptors
What receptors would detect a temperature of 52°C?
Nociceptors
True or False: More sensory neurons equal smaller receptive fields per neuron.
True
A network of nerves is known as a __________.
Plexus
Visceral pain may be perceived as cutaneous pain, a phenomenon known as __________.
Referred pain
Regions of skin supplied by a spinal nerve for somatic sensation are known as __________.
Dermatomes
Sensory transduction occurs in __________.
PNS sensory neurons
Which component of a somatic sensory neuron transmits an action potential from the peripheral process to the posterior horn?
Central process
Which nerve innervates the deltoid and teres minor muscles and the skin over the deltoid?
Axillary nerve
