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11. Function of the tricep brachii.

Ans: The tricep brrachii is the extensor muscles of the elbow joint. It can be also fixate the elbow joint when the forarm and the hand are used for fine movements.

Functions:

  • Extension of forarm at the elbow joint

  • Long head helps in bringing back the abducted or extended arm to the side of the body

12. Topography of the lateral group of the abdominal wall, their functions.

Ans: There are three muscles in the abdominal wall

  • Abdominal external oblique muscle : The external oblique functions to pull the chest downwards and compress the abdominal cavity, which increases the intra-abdominal pressure 

  • Abdominal internal oblique muscle: The internal oblique performs two major functions. Firstly as an accessory muscle of respiration, it acts as an opponent to the diaphragm, helping to reduce the volume of the chest cavity during exhalation.

Secondly, its contraction rotates and side-bends the trunk by pulling the rib cage and midline towards the hip and lower back, of the same side

  • Transversus abdominis muscle: The transverse abdominal helps to compress the ribs and viscera, providing thoracic and pelvic stability.

13. Muscles of neck, classification.

Ans: Muscles of neck can be classified into following;

  • The suboccipital muscle:

  • Rectus capitis posterior major

  • Rectus capitis posterior minor

  • Oblique capitis inferior

  • Oblique capitis superior

  • Supra hyoid muscles: Stylohyoid, digastricus, hylohyoid, geniohyoid

  • Infrahyoid muscles: Omohyoid, sternohyoid, thyrohyoid

  • Scalene muscle: Anterior, middle, Posterior scalene.

14. Function of anterior muscle of leg

Ans: Muscle of the anterior compartment of the leg;

  • Tibialis anterior: dorsiflexion and the inversion of foot.

  • Extensor hallucis longus: Extend phalanges of the great toe.

  • Extensor digitorium longus: extension and the dorsiflexion of foot.

  • Extensor dorgitorum longu brevis: extension of the proximal phalanges of great toe.

  • Peroneus tertius: Dorsiflexion and the eversion of foot.

15. Enumerate the muscle of thenar.

Ans: Muscles of the thenar components are:

  • Abductor pollicis brevis: Abduction of thumb at the metacarpophalangeal and carpometacarpal joint.

  • Flexor policies brevis: Flexion of thumb.

  • Opponens pollicis: Flexion and the medial rotation of thumb.

16. Functions of muscles of the lateral group of the leg.

Ans: Functions of the lateral compartment of leg

  • Peroneus longus (fibularis longus): Eversion of foot, maintaining arches of foot.

  • Peroneus brevis (fibularis bervies): Eversion of foot and the steadies the leg on the foot.

17. Classification of muscles of thigh and its function.

Ans: The thigh is divided into anterior, medial and the posterior compartments.

  • Anterior compartment of thigh: it act as the extensor hip and the flexor of knee

  • Psoas major, minor

  • Iliacus

  • Tensor fasciae

  • Sartorius

  • Rectus femoris

  • Articularis genu

  • Medial compartment of thigh: It is the adductor muscles:

  • The gracilis

  • The pectineus

  • The adductor longus

  • The adductor brevis

  • The adductor magnus

  • The posterior muscle of thigh; they are common to all hamstring muscle,it act as the flexion of leg at the knee.

  • Semitendinosus

  • Semimembranosus

  • Bicep femoris

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