| lateral tuberal nucleus | Nerve cell nuclei situated ventrally in the intermediate hypothalamic region, mainly in the lateral hypothalamic area [Brenda]. | — |
| cardiovascular system | The system of heart and blood vessels [Brenda]. | — |
| brain stem | The part of the brain composed of the mesencephalon, pons, and medulla oblongata and connecting the spinal cord with the forebrain and cerebrum [Brenda]. | — |
| heart | 1: A hollow muscular organ of vertebrate animals that by its rhythmic contraction acts as a force pump maintaining the circulation of the blood.n2: A structure in an invertebrate animal functionally analogous to the vertebrate heart [Brenda]. | — |
| midbrain | The middle of the three primary divisions of the developing vertebrate brain or the corresponding part of the adult brain [Brenda]. | — |
| atrium | In the heart, the atrium is an upper chamber found on both sides of the heart. The left atrium receives red, oxygenated blood from the lungs by way of the pulmonary veins. The right atrium receives dark red blood from the other parts of the body [Brenda]. | — |
| crus cerebri | The cerebral crus is the anterior portion of the cerebral peduncle which contains the motor tracts, the plural of which is cerebral crura [Wikipedia: http://en.wikipedia.org/wiki/Cerebral_crus]. | — |
| ventricle | In the heart, a ventricle is one of two large chambers that collect and expel blood received from an atrium towards the peripheral beds within the body and lungs [Wikipedia: http://en.wikipedia.org/wiki/Ventricle_(heart)]. | — |
| left ventricle | The ventricles are the two lower chambers of the heart. The left ventricle is the chamber that receives blood from the left atrium and pumps it out under high pressure to the body via the aorta [Brenda]. | — |
| superior colliculi | The optic tectum or simply tectum is a paired structure that forms a major component of the vertebrate midbrain. In mammals this structure is more commonly called the superior colliculus (Latin, upper hill), but, even in mammals, the adjective tectal is commonly used. The tectum is a layered structure, with a number of layers that vary by species. The superficial layers are sensory-related, and receive input from the eyes as well as other sensory systems. The deep layers are motor-related, capable of activating eye movements as well as other responses. There are also intermediate layers, with multi-sensory cells and motor properties [Wikipedia: http://en.wikipedia.org/wiki/Superior_colliculus]. | — |
| endocardium | A thin serous membrane lining the cavities of the heart [Brenda]. | — |
| inferior colliculi | The inferior colliculus (IC) (Latin, lower hill) is the principal midbrain nucleus of the auditory pathway and receives input from several more peripheral brainstem nuclei in the auditory pathway, as well as inputs from the auditory cortex. The inferior colliculus has three subdivisions: the central nucleus (CIC), a dorsal cortex (DCIC) by which it is surrounded, and an external cortex (ICX) which is located laterally. Its bimodal neurons are implied in auditory-somatosensory interaction, receiving projections from somatosensory nuclei. This multisensory integration may underlie a filtering of self-effected sounds from vocalisation, chewing, or respiration activities [Wikipedia: http://en.wikipedia.org/wiki/Inferior_colliculus]. | — |
| myocardium | The middle and thickest layer of the heart wall, composed of cardiac muscle [Brenda]. | — |
| substantia nigra | The substantia nigra is located in the mesencephalon (mid brain) region of the brain. It is part of the basal ganglia [Brenda]. | — |
| pericardium | 1: The conical sac of serous membrane that encloses the heart and the roots of the great blood vessels of vertebrates.n2: A cavity or space that contains the heart of an invertebrate and in arthropods is a part of the hemocoel [Brenda]. | — |
| red nucleus | The red nucleus is a structure in the rostral midbrain involved in motor coordination. It comprises a caudal magnocellular and a rostral parvocellular part [Wikipedia: http://en.wikipedia.org/wiki/Red_nucleus]. | — |
| cardiac valve | A heart valve normally allows blood flow in only one direction through the heart. The four valves commonly represented in a mammalian heart determine the pathway of blood flow through the heart. A heart valve opens or closes incumbent upon differential blood pressure on each side [Wikipedia: http://en.wikipedia.org/wiki/Heart_valve]. | — |
| periaqueductal grey matter | Periaqueductal gray (PAG; also called the "central gray") is the gray matter located around the cerebral aqueduct within the tegmentum of the midbrain. It plays a role in the descending modulation of pain and in defensive behaviour. The ascending pain and temperature fibers of the spinothalamic tract also send information to the PAG via the spinomesencephalic tract (so-named because the fibers originate in the spine and terminate in the PAG, in the mesencephalon or midbrain) [Wikipedia: http://en.wikipedia.org/wiki/Periaqueductal_gray]. | — |
| cardiac conducting system | The electrical conduction system that controls the heart rate. This system generates electrical impulses and conducts them throughout the muscle of the heart, stimulating the heart to contract and pump blood [MedTerms: http://www.medterms.com/script/main/art.asp?articlekey=8407]. | — |
| oculomotor nucleus | The fibers of the oculomotor nerve arise from a nucleus in the midbrain, which lies in the gray substance of the floor of the cerebral aqueduct and extends in front of the aqueduct for a short distance into the floor of the third ventricle. From this nucleus the fibers pass forward through the tegmentum, the red nucleus, and the medial part of the substantia nigra, forming a series of curves with a lateral convexity, and emerge from the oculomotor sulcus on the medial side of the cerebral peduncle [Wikipedia: http://en.wikipedia.org/wiki/Oculomotor_nucleus]. | — |
| artery | Any of the tubular branching muscular- and elastic-walled vessels that carry blood from the heart through the body [Brenda]. | — |
| trochlear nucleus | The nucleus of the trochlear nerve is located in the midbrain, at the level of the inferior colliculus. It is a motor nucleus, so is located near the midline [Wikipedia: http://en.wikipedia.org/wiki/Trochlear_nucleus]. | — |
| aorta | The great arterial trunk that carries blood from the heart to be distributed by branch arteries through the body [Brenda]. | — |
| mesencephalic trigeminal nucleus | The mesencephalic nucleus is involved with proprioception of the face, that is, the feeling of position of the muscles. Unlike many nuclei within the CNS, the mesencephalic nucleus contains no chemical synapses but are electrically coupled. Instead, neurons of this nucleus are pseudounipolar cells receiving proprioceptive information from the mandible, and sending projections to the motor trigeminal nucleus to mediate monosynaptic jaw jerk reflexes. It is also the only structure in the CNS to contain the cell bodies of a primary afferent, which are usually contained within ganglia (like the trigeminal ganglion) [Wikipedia: http://en.wikipedia.org/wiki/Mesencephalic_nucleus_of_trigeminal_nerve]. | — |
| arterial intima | The arterial intima incldues the endothelium, interla elastic lamina, and all intervening tissues [Stehbens, 1995: http://www.deepdyve.com/lp/elsevier/definition-of-the-arterial-intima-LB2GoUv3it]. | — |
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