Concept explainers
To review:
The names of two muscles present in the following regions or compartments:
The thenar eminence (ball of thumb), the posterior compartment of the forearm, the anterior compartment of the forearm, the anterior muscle group in the arm, the muscles of mastication, the third muscle layer of the foot, the posterior compartment of the leg, the medial compartment of the thigh, and the posterior compartment of the thigh.
Introduction:
Muscle tissues are mainly of three types, namely skeletal, cardiac, and smooth muscles. Muscles contain muscle fibers that have alternate arrangement of actin and myosin proteins. The cross-bridge formation of these protein filaments results in movement through muscular contractions. Skeletal muscles are present in the forelimbs and hindlimbs and regulate the voluntary movements of the body.
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Human Anatomy (8th Edition)
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- Match the muscles in column B to their embryonic origins in column A.Column A Column B(1) from head (occipital) myotomes (a) biceps brachii(2) from trunk (nonlimb) myotomes (b) erector spinae(3) limb extensor group (c) tongue muscles(4) limb flexor group (d) chewing muscles(5) pharyngeal arch muscles (e) triceps brachiiarrow_forwardIf a muscle is contracted and shortening, what happens to the following: (a) width of the A band, (b) width of the H zone, (c) relationship of the Z discs, and (d) width of the I band?arrow_forwardPut the following muscles in order from medial to lateral. (a) 1st (most medial) (b) 2nd (c) 3rd kes the shoulder (d) 4th (e) 5th (most lateral) 11) Iliopsoas 12) Pectineus 13) Gracilis 14) Tensor fascia latae 15) Adductor longusarrow_forward
- (a) Name two forearm muscles that are powerful extensors and abductors of the wrist. (b) Name the sole forearm muscle that can flex the distal interphalangeal joints.arrow_forwardOn what basis do fascial compartments group the muscles of the body?arrow_forwardOf the muscles illustrated in Figure, which could shorten most? Which two would likely be most powerful? Why?arrow_forward
- What is the functional reason why the muscle group on the dorsal leg (calf) is so much larger than the muscle group in the ventral region of the leg?arrow_forwardPut the following muscles in order from lateral to medial. (a) tensor fascia late (b) pectinius (c) rectus femoris (d) iliopsoas (e) adductor longus (f) gracilisarrow_forward(c) Superficial muscles, posterior view (d) Muscles under the gluteus maximus and gluteus mediusarrow_forward
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