Anterior cruciate ligament
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  Anterior cruciate ligament



Anterior cruciate ligament

   ligament in the knee that crosses from the underside of the femur (the thigh bone) to the top of the tibia (the bigger bone in the lower leg). Abbreviated ACL. Injuries to the ACL can occur in a number of situations, including sports, and can be quite serious, requiring surgery.

RELATED TERMS
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Ligament
A band of tough tissue which restrains joint movement and confers stability on a joint.

Knee
The complex hinge joint of the upper and lower leg involving the femur, tibia and patella.

Femur
The thigh bone.

Tibia
The segment of the leg between the femur and the tarsus.

Bone
Bone refers either to a hardened connective tissue or to one of the individual structures, or organs, into which it is formed, found in many animals. Bones support body structures, protect internal organs, and (in conjunction with muscles) facilitate movement; are also involved with cell formation, calcium metabolism, and mineral storage. The bones of an animal are, collectively, known as the skeleton.

ACL
Anterior cruciate ligament.

Surgery
Treating diseases or other medical conditions by operating on a patient to remove or repair parts of the body.



SIMILAR TERMS
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Ante mortem
Before death.

Antean
Exceptionally strong or large. A multi-vitamin pill may, for example, be of Antean proportions.

Antegrade
Forward-moving. As in blood flow. Sometimes synonymous with anterograde.

Antegrade amnesia
Amnesia in which the loss of memory relates to events that occur after a traumatic event. There is inability to recall new information. Old information can be recalled. Antegrade amnesia may follow brain trauma. Also called anterograde amnesia. This type of amnesia is in contrast to retrograde amnesia in which the lack of memory relates to events that occurred before a traumatic event.

Antelope Valley Hospital Medical Center
Antelope Valley Hospital Medical Center is a hospital in Lancaster, California (USA).

Antenatal surgery
The surgical treatment of the fetus before birth. Also called prenatal surgery or, most often, fetal surgery.

Antepar
Antepar is a prescription or over-the-counter drug which is (or once was) legal in the United States and possibly in other countries. Active ingredient(s): piperazine citrate.

Antepartum
Occurring before delivery of a baby.

Anterior
The front, as opposed to the posterior. The anterior surface of the heart is toward the breast bone (the sternum).

Anterior chamber
"The space in the eye that is behind the cornea and in front of the iris. The cornea is the outer, transparent, dome-like structure that covers the iris, pupil, and the anterior chamber. The iris is the colored ring of tissue suspended behind the cornea and immediately in front of the lens; it regulates the amount of light entering the eye by adjusting the size of the pupil. The anterior chamber is filled with a watery fluid known as the aqueous humor, or aqueous. Produced by a structure alongside the lens called the ciliary body, the aqueous passes first into the posterior chamber (between the lens and iris) and then flows forward through the pupil into the anterior chamber of the eye."

Anterior cruciate injury
A knee injury involving the anterior cruciate ligament (ACL). The ACL runs diagonally across the front of the knee from the underside of the femur (the thigh bone) to the top of the tibia (the bigger bone in the lower leg).

Anterior pituitary
The front portion of the pituitary, a small gland in the head called the master gland. Hormones secreted by the anterior pituitary influence growth, sexual development, skin pigmentation, thyroid function, and adrenocortical function. These influences are exerted through the effects of pituitary hormones on other endocrine glands except for growth hormone which acts directly on cells. The effects of underfunction of the anterior pituitary include growth retardation (dwarfism) in childhood and a decrease in all other endocrine gland functions normally under the control of the anterior pituitary (except the parathyroid glands). The results of overfunction of the anterior pituitary include overgrowth (gigantism) in children and a condition called acromegaly in adults.

Anterior position
When the baby faces the back of the mother's pelvis in utero and/or during labor.

Anterior teeth
The six upper or six lower front teeth.

Anterior tongue
The front two-thirds of the tongue. In contrast to the base of the tongue, which is the back third. The distinction between the anterior and base of the tongue reflects the fact that they are of different embryological origin. The distinction also matters as regards cancer. See: Tongue cancer.

Antero-
Prefix signifying before, earlier, front. From the Latin anterior meaning before.

Anterograde
Moving forward or extending forward. Anterograde memory is memory for what occurs after an event such as an accident. Also called antegrade. From the Latin antero- + gredior (to step or go).

Anterograde amnesia
See: Antegrade amnesia.

Anterograde memory
Loss of short-term memory with retention of memories from the distant past (long-term memory).

Anteroposterior
From front to back. When a chest x-ray is taken with the back against the film plate and the x-ray machine in front of the patient it is called an anteroposterior (AP) view. As opposed to from back to front (which is called posteroanterior).

Anteroposterior (AP)
In anatomy, AP stands for anteroposterior: from front-to-back. For example, an AP X-ray of the chest is taken from front-to-back. AP in this respect is the opposite of PA, which stands for posteroanterior: from back-to-front.



PREVIOUS AND NEXT TERMS
--------------------------------------

Antegrade amnesia
Amnesia in which the loss of memory relates to events that occur after a traumatic event. There is inability to recall new information. Old information can be recalled. Antegrade amnesia may follow brain trauma. Also called anterograde amnesia. This type of amnesia is in contrast to retrograde amnesia in which the lack of memory relates to events that occurred before a traumatic event.

Antenatal surgery
The surgical treatment of the fetus before birth. Also called prenatal surgery or, most often, fetal surgery.

Anterior
The front, as opposed to the posterior. The anterior surface of the heart is toward the breast bone (the sternum).

Anterior chamber
"The space in the eye that is behind the cornea and in front of the iris. The cornea is the outer, transparent, dome-like structure that covers the iris, pupil, and the anterior chamber. The iris is the colored ring of tissue suspended behind the cornea and immediately in front of the lens; it regulates the amount of light entering the eye by adjusting the size of the pupil. The anterior chamber is filled with a watery fluid known as the aqueous humor, or aqueous. Produced by a structure alongside the lens called the ciliary body, the aqueous passes first into the posterior chamber (between the lens and iris) and then flows forward through the pupil into the anterior chamber of the eye."

Anterior cruciate injury
A knee injury involving the anterior cruciate ligament (ACL). The ACL runs diagonally across the front of the knee from the underside of the femur (the thigh bone) to the top of the tibia (the bigger bone in the lower leg).

Anterior cruciate ligament

Anterior pituitary
The front portion of the pituitary, a small gland in the head called the master gland. Hormones secreted by the anterior pituitary influence growth, sexual development, skin pigmentation, thyroid function, and adrenocortical function. These influences are exerted through the effects of pituitary hormones on other endocrine glands except for growth hormone which acts directly on cells. The effects of underfunction of the anterior pituitary include growth retardation (dwarfism) in childhood and a decrease in all other endocrine gland functions normally under the control of the anterior pituitary (except the parathyroid glands). The results of overfunction of the anterior pituitary include overgrowth (gigantism) in children and a condition called acromegaly in adults.

Anterior tongue
The front two-thirds of the tongue. In contrast to the base of the tongue, which is the back third. The distinction between the anterior and base of the tongue reflects the fact that they are of different embryological origin. The distinction also matters as regards cancer. See: Tongue cancer.

Antero-
Prefix signifying before, earlier, front. From the Latin anterior meaning before.

Anterograde
Moving forward or extending forward. Anterograde memory is memory for what occurs after an event such as an accident. Also called antegrade. From the Latin antero- + gredior (to step or go).

Anterograde amnesia
See: Antegrade amnesia.

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