21 a Musculi pectinati. Muscular trabeculae in the left atrium that resemble the teeth of a comb.

22 Valve of foramen ovale. Valvula foraminis ovalis [falx septi]. Floor of the fossa ovalis derived from the septum primum. In the fetus it is pushed into the left atrium by the flow of blood. B

23 Ostia venarum pulmonalium. Openings ofpul-monary veins into the left atrium. B

24 Left ventricle. Ventriculus sinister. B

25 Ostium atrioventriculare sinistrum. Left atri-oventicular opening between the left atrium and left ventricle. A

26 Left atrioventricular (mitral) valve. Valva atri-oventricularis sinistra (v. mitralis) [[valvula bi-cuspidalis]]. Valvular apparatus between the left atrium and left ventricle. It consists of two parts which arise from the fibrous ring and are united with the papillary muscles of the left ventricle by means of chordae tendineae. A

27 Anterior cusp. Cuspis anterior. Cusp situated anterior to the interventricular septum. A B

28 Posterior cusp. Cuspis posterior. Cusp situated posterior to the lateral wall. A B

28 a Cuspides commissurales.

190 Heart, Arteries

1 Ostium aortae. Opening of left ventricle leading into the aorta. A

1a Trabeculae carneae. Muscle bundles projecting into the lumen of the heart. A

2 Aortic valve. Valva aortae. Tripartite valvular apparatus lying at the beginning of the aorta. A

3 Posterior semilunar cusp of aortic valve. Valvula semilunaris posterior. A

4 Right semilunar cusp ofaortic valve. Valvula semilunaris dextra. A

5 Left semilunar cusp of aortic valve. Valvula semilunaris sinistra. A

6 Nodules of semilunar cusps. Noduli valvu-larum semilunarium. Thickenings in the middle of each free margin of a semilunar cusp that seals the wedge-shaped space between the three cusps when closed. A

7 Lunules of semilunar cusps. Lunulae valvu-larum semilunarium. Thin, crescentic areas near the margin of the semilunar cusps on either side of their nodules. A

18 Anterior papillary muscle. Musculus papillaris anterior. A

19 Posterior papillary muscle. Musculus papil-laris posterior. A

10 ARTERIES. Arteria. Blood vessels which transport blood away from the heart.

11 PULMONARY TRUNK. Truncus pulmonalis. Arterial trunk between the right ventricle and the beginning of the left and right pulmonary arteries. B

12 Sinuses of pulmonary trunk. Sinus trunci pul-monalis. Three dilatations of the wall of the pulmonary trunk, each at the root of a semilunar valve. B

13 Bifurcation of pulmonary trunk. Bifurcatio trunci pulmonalis. Division of the pulmonary trunk into its two branches. B

14 Right pulmonary artery. A. pulmonalis dextra. It lies behind the ascending aorta. B

14 a Branches to superior lobe. Rami lobi super-


15 Apical branch. Ramus apicalis. Branch to the apical segment. B

16 Posterior descending branch. Ramus posterior descendens. Branch to the lower part of the posterior segment. B

17 Anterior descending branch. Ramus anterior descendens. Branch to the lower part of the anterior segment. B

18 Anterior ascending branch. Ramus anterior ascendens. Branch to the upper part of the anterior segment. B

19 Posterior ascending branch. Ramus posterior ascendens. Branch to the upper part of the posterior segment. B

20 Main branches for middle lobe. Rami lobi medii. B

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Essentials of Human Physiology

Essentials of Human Physiology

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