|Latin||Aponeurosis (plural: Aponeuroses)|
Aponeuroses (plural of aponeurosis: απο, "away" or "of", and νευρον, "sinew", and pronounced ap·o·neu·ro·sis) are layers of flat broad tendons. They have a shiny, whitish-silvery color, are histologically similar to tendons, and are very sparingly supplied with blood vessels and nerves. When dissected, aponeuroses are papery and peel off by sections. The primary regions with thick aponeurosis are in the ventral abdominal region, the dorsal lumbar region, the ventriculus in birds, and the palmar and plantar regions.
Anterior abdominal aponeuroses
Posterior lumbar aponeuroses
Palmar and plantar aponeuroses and extensor hood
The palmar aponeuroses occur on the palms of the hands. The extensor hoods are aponeuroses at the back of the fingers.
The plantar aponeuroses occur on the plantar aspect of the foot. They extend from the calcaneal tuberosity then diverge to connect to the bones, ligaments and the dermis of the skin around the distal part of the metatarsal bones.
Anterior and posterior intercostal membranes
The anterior and posterior intercostal membranes are aponeuroses located between the ribs and are continuations of the external and internal intercostal muscles, respectively.
Pennate muscles & Aponeuroses
Pennate muscles, in which the muscle fibers are oriented at an angle to the line of action, typically have two aponeuroses. Muscle fibers connect one to the other, and each aponeurosis thins into a tendon which attaches to bone at the origin or insertion site.
Like tendons, aponeuroses attached to pennate muscles can be stretched by the forces of muscular contraction, absorbing energy like a spring and returning it when they recoil to unloaded conditions.
- Aponeurosis of the Obliquus externus abdominis
- Aponeurosis of the Serratus posterior superior muscle
- Plantar aponeurosis
- Inguinal aponeurotic falx
- Bicipital aponeurosis
- Palatine aponeurosis
- This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). Encyclopædia Britannica (11th ed.). Cambridge University Press.