Neuroanatomy and Speech-Language Pathology Exam 1 Review

Comprehensive vocabulary flashcards covering neuroanatomy, cranial nerve functions and lesions, cerebellar pathology, developmental neurobiology, and neuroimaging principles.

Vestibulocochlear Nerve (CN VIII)

The eighth cranial nerve responsible for hearing and equilibrium; lesions produce vertigo, hearing loss, and balance impairment.

Dorsal Column-Medial Lemniscal Pathway

An ascending sensory pathway in the spinal cord that transmits conscious proprioception, vibration, and fine touch, such as identifying toe position with eyes closed.

Ventral Ramus

The anterior branch of a spinal nerve carrying both motor and sensory fibers; an injury to a ventral ramus contributing to the brachial plexus causes mixed motor and sensory deficits in the corresponding peripheral nerve distribution.

Vertebral Canal

The anatomical channel formed by the vertebral column that houses and protects the spinal cord.

Lateral Funiculus

The lateral white matter column of the spinal cord that contains descending motor fibers of the lateral corticospinal tract.

Vestibulospinal Tract

A descending motor pathway involved in facilitating extensor muscle tone and maintaining postural stability in response to acceleration and balance changes.

Lateral Corticospinal Tract

A primary descending voluntary motor pathway essential for skilled, fractionated movements of distal extremities, such as moving individual fingers to button a shirt.

Cerebellar Vermis

The medial zone of the cerebellum primarily responsible for trunk stability, axial posture, and gait coordination.

Dysdiadochokinesia

A clinical sign of cerebellar dysfunction characterized by the inability to execute smooth, rapid alternating movements, such as alternating palm-up and palm-down postures.

Ataxic Dysarthria

A motor speech disorder resulting from cerebellar damage characterized by slurred, rhythmically irregular speech broken into individual syllables without significant muscle weakness.

Dysmetria

A cerebellar deficit characterized by an inability to properly gauge distance and scale movement, resulting in overshooting or undershooting a targeted endpoint during reaching or finger-to-nose testing.

Pontocerebellar Pathway

A cerebellar pathway involved in motor planning and smooth sequencing of complex, rapid, and practiced movements, such as a pianist executing rapid finger passages.

Corticobulbar Upper Motor Neuron Lesion (CN VII)

An upper motor neuron injury resulting in weakness of the contralateral lower face with preservation of forehead movement due to bilateral cortical innervation of upper facial muscles.

Corneal Reflex

A protective eye-blink reflex that relies on sensory afferent input through the ophthalmic division ($V_1$) of the trigeminal nerve and motor efferent output through the facial nerve (CN VII).

Trochlear Nerve (CN IV)

The cranial nerve innervating the superior oblique muscle of the eye; damage leads to vertical double vision that worsens when walking downstairs and prompts compensatory head tilting.

Hypoglossal Lower Motor Neuron Lesion (CN XII)

An injury to the twelfth cranial nerve causing ipsilateral tongue atrophy, fasciculations, and deviation toward the side of the lesion upon tongue protrusion.

Maxillary Division ($V_2$)

The second sensory branch of the trigeminal nerve that supplies the skin of the upper lip, cheek, and maxillary teeth.

Oral Preparatory Cranial Nerves (CN V and CN VII)

The cranial nerves providing voluntary control for mastication via the trigeminal motor branches (CN V) and lip closure via the facial nerve (CN VII) to prevent oral spillage.

Oculomotor Nerve (CN III)

The cranial nerve controlling most extraocular muscles, the levator palpebrae superioris, and pupillary constriction; damage produces ptosis, pupillary dilation, and an eye resting in a downward and outward position.

Bitemporal Hemianopia

A visual field defect marked by the loss of both temporal (peripheral) visual fields with intact central vision, caused by a lesion compressing the optic chiasm.

Vagus Nerve (CN X)

The tenth cranial nerve innervating intrinsic laryngeal and pharyngeal muscles; damage impairs vocal fold abduction/adduction, producing a breathy voice, weak voluntary cough, and swallowing difficulty.

Cortical Organization and Synaptogenesis

A developmental phase of the nervous system focused on dendritic proliferation, axonal arborization, and the formation of functional synaptic junctions.

Telencephalon

The anterior embryonic forebrain vesicle that develops into the adult cerebral hemispheres.

Synaptic Pruning and Prefrontal Maturation

The ongoing neurodevelopmental remodeling and refinement of regulatory prefrontal circuits during adolescence that accounts for impulsive decision-making despite intact risk awareness.

Ventral Induction

The developmental phase involving the cleavage and formation of the ventral forebrain; its failure results in holoprosencephaly, where the forebrain fails to divide into distinct hemispheres.

Structural Imaging

A category of neuroimaging (such as CT and MRI) focused on static anatomical visualization to answer 'Where is the lesion?' rather than measuring dynamic functional activity.

Prevalence

The overall proportion of individuals in a population exhibiting a condition at a given time; conceptually modeled as a bathtub that increases when new cases (incidence) enter and fewer individuals exit through mortality.

Connectionist Perspective

The theoretical model positing that complex functions like language rely on specialized cerebral areas working cooperatively through interconnected neural pathways.

Magnetic Resonance Imaging (MRI)

A structural imaging technique offering detailed multiplanar soft-tissue visualization without ionizing radiation, but presenting limitations for individuals with claustrophobia or metallic implants.

Functional Magnetic Resonance Imaging (fMRI)

A functional neuroimaging method that detects blood-oxygen-level-dependent changes to provide superior spatial localization of active brain regions during cognitive or speech tasks.

EEG / MEG

Electrophysiological neuroimaging modalities (electroencephalography and magnetoencephalography) prioritized for exceptional temporal resolution to capture rapid, millisecond-level neural responses.

Computed Tomography (CT)

A rapid, cost-effective, and widely accessible structural imaging technique using x-rays, ideally suited for acute emergency evaluation when soft-tissue contrast is not the primary priority.

Social Model of Disability

A conceptual framework asserting that disability is created or exacerbated by environmental, architectural, and systemic barriers rather than exclusively by individual physiological pathology.

Standard Anatomical Position

The universal reference position in which directional descriptions such as left and right are defined strictly from the patient's perspective.

Ipsilateral

A directional term describing structures, pathways, or symptoms occurring on the same side of the body relative to a reference point or lesion.

Coronal (Frontal) Plane

A vertical anatomical plane dividing the body or brain into anterior (front) and posterior (back) sections.

Sagittal Plane

An anatomical sectioning plane that divides the brain or body into left and right portions.

Rostral

A directional term designating an orientation toward the anterior aspect or front pole of the cerebral hemispheres.

Clinical (Radiological) Orientation

An imaging convention where the patient's right side is displayed on the viewer's left side and the patient's left is on the viewer's right.

Superior

A directional anatomical term meaning positioned higher or situated above another structure (for example, the brain is superior to the heart).