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The thalamus acts as the final relay station for all sensory pathways, except for the olfactory sense. It influences motor activity based on sensory experiences, maintains wakefulness and alertness, and is associated with autonomic control of viscera.
The nuclei of the thalamus include the anterior nuclear group, medial nuclear group, lateral nuclear group, intra-laminar group, midline nuclei, and reticular thalamic nucleus.
The internal capsule consists of the anterior limb, genu, posterior limb, retro-lentiform part, and sub-lentiform part.
The cerebral aqueduct contains cerebrospinal fluid (CSF).
The Circle of Willis is formed by the anterior cerebral arteries (branches of the internal carotid artery) and the posterior cerebral arteries (branches of the basilar artery).
The brainstem is the part of the central nervous system that connects the brain to the spinal cord and is responsible for regulating vital functions such as breathing, heart rate, and blood pressure.
The apex of the heart is formed by the left ventricle and is situated in the left 5th intercostal space, slightly below and medial to the left nipple.
The anterior atrioventricular groove contains the trunk and circumflex branch of the left coronary artery, the termination of the great cardiac vein, and the commencement of the coronary sinus.
The crux of the heart indicates the junction of the inter-atrial septum, the posterior inter-ventricular septum, and the posterior part of the atrioventricular grooves.
The openings of the right atrium include the opening of the superior vena cava (SVC), the opening of the inferior vena cava (IVC), the opening of the coronary sinus, anterior cardiac veins, foramen ovale (foramina venarum minimarum), and the right atrioventricular opening.
Chordae tendineae help in the closure of the heart valves during systole and prevent the turning of the valve cusps towards the atrium.
Papillary muscles are attached at one end to the ventricular wall and at the other end to the cusps of the valve via chordae tendineae.
The cauda equina is formed by the ventral and dorsal nerve roots of the lower four pairs of lumbar, five pairs of sacral, and one pair of coccygeal nerves within the subarachnoid space.
A spinal nerve is formed by the union of the ventral and dorsal spinal nerve roots.
The filum terminale is a fibrous extension of the spinal cord that extends from the tip of the conus medullaris to the first coccygeal vertebra.
The central canal of the spinal cord contains cerebrospinal fluid (CSF).
The eyeball is composed of three tunics: the outer tunic (sclera and cornea), the intermediate tunic (choroid, ciliary body, and iris), and the inner tunic (retina).
The refractive media of the eye includes the cornea, aqueous humor, lens, and vitreous body.
The thalamus serves as a relay station for sensory information, processing and transmitting it to the appropriate areas of the cerebral cortex for interpretation.
The internal capsule contains important motor pathways that transmit signals from the cerebral cortex to the brainstem and spinal cord, facilitating voluntary movement.
The anterior and posterior inter-ventricular grooves are significant as they house the coronary arteries and veins, which supply blood to the heart muscle.