- Tarsus (eyelids)
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Caption = The tarsi and their ligaments. Right eye; front view.
Caption2 = The right eye in sagittal section, showing the fascia bulbi. (Tarsi labeled at right.)
The tarsi (tarsal plates) are two thin, elongated plates of
dense connective tissue, about 2.5 cm. in length; one is placed in each eyelid, and contributes to its form and support. They directly abut the lid margins. [ "eye, human."Encyclopædia Britannica. 2008. Encyclopædia Britannica 2006 Ultimate Reference Suite DVD 5 Apr. 2008 ]
The "superior tarsus" (tarsus superior; superior tarsal plate), the larger, is of a
semilunarform, about 10 mm. in breadth at the center, and gradually narrowing toward its extremities.
To the anterior surface of this plate the aponeurosis of the
Levator palpebræ superiorisis attached.
The "inferior tarsus" (tarsus inferior; inferior tarsal plate), the smaller, is thin, elliptical in form, and has a vertical diameter of about 5 mm. The free or ciliary margins of these plates are thick and straight.
The attached or orbital margins are connected to the circumference of the orbit by the
The lateral angles are attached to the
zygomatic boneby the lateral palpebral raphé.
The medial angles of the two plates end at the
lacrimal lake, and are attached to the frontal process of the maxillaby the medial palpebral ligament).
Meibomian glandsare aligned vertically within the tarsi: 30 to 40 glands in the upper lid, and 20 to 30 in the lower lid.
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Tarsus — (from the Greek ταρσός, for flat basket ) may refer to:*Tarsus (skeleton), the skeletal region between the tibia and fibula and the metatarsus *Tarsus (eyelids)*The final segment of an arthropod leg *Tarsus (city), ancient and modern city in… … Wikipedia
tarsus — 1. As a division of the skeleton, the seven tarsal bones of the instep. SYN: root of foot. See tarsal bones, under bone. [G. tarsos, a flat surface, sole of the foot, edge of eyelid] 2. The fib … Medical dictionary
tarsus inferior palpebrae — [TA] the firm framework of connective tissue that gives shape to the lower eyelids … Medical dictionary
tarsus superior palpebrae — [TA] the firm framework of connective tissue that gives shape to the upper eyelids … Medical dictionary
Tarsal — could refer to:*tarsus (skeleton) (skeleton) *tarsus (eyelids) (eye) … Wikipedia
Eyelid — Palpebrae redirects here. For the levator palpebrae, see levator palpebrae superioris muscle. Eyelid Upper and lower eyelids Latin palpebra inferior, palpebra superior … Wikipedia
tarsal — Relating to a tarsus in any sense. * * * tar·sal tar səl adj 1) of or relating to the tarsus 2) being or relating to plates of dense connective tissue that serve to stiffen the eyelids tarsal n a tarsal part (as a bone or cartilage) * * * 1. adj … Medical dictionary
Meibomian gland — Front of left eye with eyelids separated to show medial canthus and openings of tarsal (meibomian) glands. Latin glandulae tarsales Gray s … Wikipedia
Canthus — For other uses, see Canthus (disambiguation). Canthus Front of left eye with eyelids separated to show medial canthus. Canthus (pl. canthi, palpebral commissures) is either corner of the eye where the upper and lower eyelids meet … Wikipedia
eyelid — One of the two movable folds covering the front of the eyeball when closed; formed of a fibrous core (tarsal plate) and the palpebral portions of the orbicularis oculi muscle covered with skin on the … Medical dictionary