What does aponeurosis mean in anatomy?
aponeurosis, a flat sheet or ribbon of tendonlike material that anchors a muscle or connects it with the part that the muscle moves. The aponeurosis is composed of dense fibrous connective tissue containing fibroblasts (collagen-secreting spindle-shaped cells) and bundles of collagenous fibres in ordered arrays.
What is the function of aponeurosis?
1. A: aponeuroses are extensions of external tendons on the surface of pennate muscles that function as insertion sites for muscle fascicles and may play a role in modulating fascicle rotation and dynamic gearing during muscle contractions.
What is levator function?
The function of the levator palpebrae superioris muscle is to raise the upper eyelid and to maintain the upper eyelid position. The levator palpebrae superioris muscle origin is the periosteum of the lesser wing of the sphenoid bone, superior to the optic foramen.
Where is the levator eye muscle located?
superior eyelid
Levator palpebrae superioris is a triangular muscle that extends along the roof of the orbit, from the apex of orbit to the superior eyelid. It originates with a short and narrow tendon from the inferior aspect of the lesser wing of sphenoid bone, superior and anterior to the common tendinous ring.
What does Aponeurotic mean?
ap·o·neu·ro·sis (ăp′ə-no͝o-rō′sĭs, -nyo͝o-) pl. ap·o·neu·ro·ses (-sēz′) A sheetlike fibrous membrane, resembling a flattened tendon, that serves as a fascia to bind muscles together or as a means of connecting muscle to bone.
What is a tendon and aponeurosis?
Aponeurosis is an extremely delicate, thin sheath-like structure, which attaches muscles to the bones whereas tendons are tough, rounded cord-like structures which are extensions of the muscle. Normally, tendons allow the attachment of the muscle from its originating bone to the bone on which it ends.
What is levator aponeurosis advancement?
An external levator advancement is used to repair ptosis when the levator muscle function is normal, but its tendinous attachment (levator aponeurosis) is stretched and needs to be reinserted.
What is the origin of the orbicularis oculi muscle?
| Orbicularis oculi muscle | |
|---|---|
| Origin | frontal bone; medial palpebral ligament; lacrimal bone |
| Insertion | lateral palpebral raphe |
| Artery | ophthalmic, zygomatico-orbital, angular |
| Nerve | Temporal (orbital, palpebral) & zygomatic (lacrimal) branches of facial nerve |
What is an aponeurosis tendon and ligament?
Aponeuroses, fasciae, ligaments and tendons are structures seen along with muscles. Fasciae are the auxillary tissues that connect muscle to muscle while ligaments are connective tissues that connect one bone to another bone. Aponeuroses and tendons are connective tissues that connect muscles to bones.
How is the aponeurosis of the levator muscle advanced?
External (transcutaneous) levator advancement: Through an upper eyelid crease incision, the levator aponeurosis is surgically dissected from the tarsus and superiorly from the overlying orbital fat. A partial thickness suture is passed through the tarsus and through the levator muscle, resulting in an advancement of the levator muscle.
Where is the levator palpebrae superioris muscle located?
The levator aponeurosis is a fascial tissue that connects the levator palpebrae superioris muscle (levator muscle) to the tarsus, a thick plate of connective tissue that lies in the upper eyelid, as well as to the overlying skin. The levator aponeurosis transmits the force of the levator muscle to lift the upper eyelid.
How is levator function related to frontalis function?
Levator function (upper eyelid excursion): The distance from the upper eyelid margin in downgaze to upgaze with frontalis muscle function neutralized. Normal eyelid excursion is 12-17 mm. Hering’s law of equal innervation: The levator muscles obey Hering’s law of equal innervation, meaning they are innervated symmetrically.
Where is the levator scapulae muscle located in the body?
Functionally, however, it is considered to be a muscle of scapular motion along with the rhomboids, serratus anterior, serratus posterior superior and inferior muscles. The levator scapulae muscle extends from the transverse processes of vertebrae C1-C4 to the medial border of scapula.