Internal Muscle Structure

Label the diagram with the options provided.

g

h

i

f

e

d

c

b

a

inguinal ligament

rectus abdominis

serratus anterior

internal oblique

linea alba

external oblique

tendinous intersections

transversus abdominis

abdominal aponeurosis

Identify this muscle highlighted in blue.

• erector spinae

• internal obliques

• transversus abdominis

• quadratus lumborum

• rectus abdominis

Identify the STRUCTURES highlighted in blue.

• linea alba

• linea aspera

• tendinous intersections

• inguinal ligaments

• abdominal aponeurosis

Within a sarcomere the thin myofilament is called:

• Actin

• Myosin

Which part of the sarcomere includes only myosin (H-zone)?

• C

• A

• B

• D

Which part of the sarcomere includes only actin (I-band)?

• E

• D

• A

• C

The connective tissue surrounding the muscle bundles is called:

• Perimysium

• Endomysium

• Epimysium

• Sarcolemma

The connective tissue that surrounds the muscle fibers is called:

• Endomysium

• Epimysium

• Sarcolemma

• Perimysium

What are the 2 types of myofilaments:

• sarcomeres and proteins

• thick and thin

• cardiac and smooth

Which is the middle of a sarcomere (M-line)?

• A

• D

• E

• C