Muscle Origin, Insertion, Action

Questions and Answers

Qual es le origine de Rectus Abdominis?

Pubic Crest and Pubic Symphysis (correct)

Linea Alba

Outer surfaces of lower 8 ribs

Xiphoid process

Qual es le insertion de Rectus Abdominis?

Lower margin of mandible

Linea Alba

Intertuburcular groove of humerus

Costal cartilages of 5, 6, 7 ribs (correct)

Qual es le action de Rectus Abdominis?

Depress hyoid bone

Compress abdominal wall

Stabilizes scapula

Flex and rotate vertebral column (correct)

Qual es le origine de External Oblique?

Outer surfaces of lower 8 ribs Signup and view all the answers

Qual es le action de External Oblique?

Flexes vertebral column Signup and view all the answers

Qual es le origine de Internal Oblique?

Lumbar fascia, iliac crest, inguinal ligament Signup and view all the answers

Qual es le action de Transverse Abdominis?

Compress abdominal contents Signup and view all the answers

Qual es le origine de Platsyma?

Skin over lower neck, upper lateral chest Signup and view all the answers

Qual es le action de Sternocleidomastoid?

Flexes and laterally rotates cervical spine Signup and view all the answers

Le origine de Latissimus Dorsi es _____

T6-L5, lower 3-4 ribs, iliac crest, scapula Signup and view all the answers

Qual es le action de Quadratus Lumborum?

Both A and B Signup and view all the answers

Qual es le action de Intercostals?

Draw ribs together Signup and view all the answers

Study Notes

Rectus Abdominis

Originates from the pubic crest and pubic symphysis.
Inserts at the xiphoid process and the costal cartilages of the 5th, 6th, and 7th ribs.
Functions to flex and rotate the vertebral column.

External Oblique

Originates from the outer surfaces of the lower 8 ribs.
Inserts into the linea alba via aponeurosis, pubic crest, tubercle, and iliac crest.
Acts to flex the vertebral column, compress the abdominal wall, and rotate the trunk laterally.

Internal Oblique

Originates from the lumbar fascia, iliac crest, and inguinal ligament.
Inserts into the linea alba, pubic crest, last 3-4 ribs, and costal margin.
Functions to flex the vertebral column, compress the abdominal wall, and rotate the trunk.

Transverse Abdominis

Originates from the cartilage of the last 6 ribs, lumbar fascia, iliac crest, and inguinal ligament.
Inserts at the linea alba and pubic crest.
Works to compress abdominal contents.

Platsyma

Originates from the skin over the lower neck, upper lateral chest, and pectoral muscles.
Inserts at the lower margin of the mandible.
Functions to tense the neck and depress the mandible.

Sternohyoid

Originates from the sternum (manubrium) and clavicle.
Inserts at the lower margin of the hyoid bone.
Acts to depress the hyoid bone and larynx.

Sternocleidomastoid

Originates from the sternum (manubrium) and medial point of the clavicle.
Inserts at the mastoid process of the temporal bone and superior nuchal line of the occipital bone.
Functions to flex and laterally rotate the cervical spine, move the head, and extend the neck.

Rhomboids

Originates from the spinous processes of C7-T1 (minor) and T2-T5 (major).
Inserts at the medial border of the scapula.
Stabilizes the scapula.

Trapezius

Originates from the occipital bone, ligamentum nuchae, and spinous processes of C7-T12.
Inserts continuously along the acromion, spine of scapula, and clavicle.
Functions to stabilize, rotate, retract, and raise the scapula.

Latissimus Dorsi

Originates from T6-L5 vertebrae, lower 3-4 ribs, iliac crest, and scapula.
Inserts into the intertubercular groove of the humerus.
Performs arm extension, adduction, and medial rotation.

Iliocostalis

Originates from the iliac crest, inferior 6 ribs, and ribs 3-6.
Inserts at the angles of the ribs and transverse processes of C4-C6.
Functions to extend and laterally flex the spine.

Longissimus

Originates from the transverse processes of lumbar through cervical vertebrae.
Inserts at the transverse processes of cervical and thoracic vertebrae and the mastoid process.
Acts to extend and laterally flex the spine, and to extend the head while turning the face towards the same side.

Quadratus Lumborum

Originates from the iliac crest and lumbar fascia.
Inserts at the 12th rib and transverse processes of L1-L4.
Functions to flex the vertebral column laterally, maintain upright posture, and assist in forced inspiration.

Intercostals

Originates from the superior surface of the rib above.
Inserts into the rib below.
Functions to draw the ribs together and depress the rib cage during expiration.

Description

Este quiz tracta le origines, insertiones e actiones de varios muscules, inclusiv le Rectus Abdominis e le External Oblique. Examina tu cognoscentia per identificar le partes e functiones de istos muscules in le corpo humano. Perfecte pro estudantes de anatomia e fisiologia.