Functional Anatomy of the Brain Descriptions (Exam 1) Flashcards
Frontal Lobe
programming motor patterns
learning and behavior
Occipital Lobe
Contain centers for vision (visual cortices)
Olfactory Lobe
Center for smell
Parietal Lobe
Touch, temperature, pressure, pain (nociception)
Conscious control of skeletal muscle activity
Piriform Lobe
Receive olfactory information (axons) via the olfactory tracts
Temporal Lobes
Centers for hearing (auditory cortices)
Diencephalon
Thalamus: receives, processes, relays to the cerebral cortex information from other regions of the brain and most sensory information (NO olfaction)
Hypothalamus: regulation of ANS and visceral and endocrine functions
Dorsal Metencephalon
Cerebellum
Controls the rate, range, and force of voluntary movements (does NOT initiate movements)
Mesencephalon
Midbrain
Control of motor functions, coordination of visual and auditory reflexes, processing of sensory information (auditory)
Myelencephalon
Medulla Oblongata
Autonomic functions
Arousal
Muscle tone for posture and movement
Telencephalon
Paired cerebral hemispheres
Cerebral Cortex: site of awareness, initiation of voluntary movements, and perception of stimuli
Basal Ganglia: planning and initiation of motor activities
Hippocampus: processing and storage of memories
Ventral Metencephalon
Pons
Conveys information about movement from the cerebrum to the cerebellum
Auditory Cortex
Acoustic area for conscious perception of sound
Motor Cortex
Neurons influence contralateral lower motor neurons innervating skeletal muscles
Neurons within the postcruciate gyrus influence appendicular musculature
Neurons with the rostral suprasylvian gyrus influence muscles of the neck and specific muscles of the head
Olfactory Cortex
Olfactory information is perceived, processed, and distributed to other parts of the brain within the piriform lobes
Visual Cortex
Vision
Somesthetic Cortex
Receive sensory information from defined regions of the body
Limbs and trunk
Abducent N.
Cranial Nerve VI
Innervates the retractor bulbi and lateral rectus muscles of the eyeball
Accessory N.
Cranial Nerve XI
Innervates muscles of the neck and forelimb that are of brachial arch origin
Facial N.
Cranial Nerve VII
Innervates the muscles of facial expression (superficial muscles of the head and face + the caudal belly of the digastricus, platysma, stylohyoid, and stapedius muscles)
Sensory for taste in the rostra 2/3 of tongue via chorda tympani nerve
Parasympathetic innervation to the mandibular and monostomatic part of the sublingual salivary glands and lacrimal gland
Glossopharyngeal N.
Cranial Nerve IX
Lingual and pharyngeal branches
Motor (somatic): m. stylopharyngeus + other pharyngeal mm
Parasympathetic: parotid and zygomatic salivary glands via otic ganglion
Sensory: taste, mechanoreception, thermoreception, nociception for caudal 1/3 of tongue
Hypoglossal N.
Cranial Nerve XII
Innervates intrinsic and extrinsic muscles of the tongue
Oculomotor N.
Cranial Nerve III
Arises from midbrain
Innervates dorsal, ventral, medial rectus muscles, ventral oblique muscle, and levator palpebrae superioris muscle
Provides parasympathetic innervation via the ciliary ganglion to constrict the pupil and round the lens
Optic N.
Cranial Nerve II
Nerves of sight
Nerve fibers originate as axons of ganglion neurons of the retina, leave the eye via optic disk and form optic nerve
Trigeminal N.
Cranial Nerve V
Muscles of mastication and skin of face
Ophthalmic N.
Maxillary N.
Mandibular N.
Ophthalmic N.
Branch of trigeminal n.
Sensory to eyeball skin of forehead, caudal muzzle, medial canthus of eye, nasal mucosa
Maxillary N.
Sensory to upper jaw (lateral canthus of eye, nose, upper lip, cheek, mucosa of tongue, oral vestibule, floor of mouth) and temporal and zygomatic regions (skin, external acoustic meatus, tympanic membrane, parotid salivary gland, guttural pouch in horse)
Mandibular N.
Motor to muscles of mastication (masseter, temporalis, medial and lateral pterygoid, mylohyoid, rostral belly of digastricus)
Sensory to lower jaw (skin of chin, lower lips, mandibular teeth, mucosa of tongue, oral vestibule, floor of mouth) and temporal and zygomatic regions
Vagus N.
Cranial Nerve X
Innervates the muscles of the pharynx, larynx, and esophagus
Contains visceral afferents from the pharynx, larynx, and esophagus
Innervates taste buds of the palate and pharynx
Innervates thoracic and abdominal visceral (parasympathetic)
Contains afferents from the skin of the external ear canal
Vestibulocochlear N.
Cranial Nerve VIII
Hearing (cochlear)
Balance and equilibrium (vestibular)
Arbor Vitae
White matter tracts visibly seen branching within the gray matter of the cerebellum
Brachium of the Caudal Colliculus
Functions in relay of auditory information
Caudal Colliculus
auditory
Cerebellar Peduncle
connects the cerebellum with the brain stem