Retrieval Quiz 16

What motions can the neck and trunk do?

Rotation, lateral flexion, flexion, and extension

What is the anterior neck muscle?

Sternocleidomastoid

What are the lateral neck muscles?

Scalene (anterior, posterior, and middle)

What are the posterior neck muscles?

Splenius capitis and splenius cervicis

What are the posterior neck and trunk muscles?

Erector spinae group (iliocostalis, spinalis, longissimus)

What are the anterior trunk muscles?

External oblique, internal oblique, rectus abdominis

What is the lateral trunk muscle?

Quadratus Lumborum

What muscles perform neck rotation?

Sternocleidomastoid (opposite) and splenius capitis (same)

What muscles perform neck flexion?

Sternocleidomastoid and scalenes

What muscles perform neck extension?

Splenius capitis, splenius cervicis, and erector spinae group

What muscles perform neck lateral flexion?

Sternocleidomastoid (same), scalenes (same), splenius capitis (same), and splenius cervicis (same)

What muscles perform trunk rotation?

External oblique (opposite) and internal oblique (same)

What muscles perform trunk lateral flexion?

Erector spinae group (same), external oblique (same), internal oblique (same), and quadratus lumborum

What muscles perform trunk flexion?

Rectus abdominis, external oblique, and internal oblique

What muscle performs trunk extension?

Erector spinae group

Sternocleidomastoid

Origin: sternum and clavicle. Insertion: mastoid process. Action: Bilateral neck flexion. Unilateral neck lateral flexion to same side and rotation to opposite side

Scalene

Origin: transverse processes of cervical vertebrae. Insertion: first and second ribs. Action: Bilateral neck flexion. Unilateral lateral neck flexion to same side

Splenius Capitis

Origin: spinous processes of C7-T3. Insertion: lateral occipital bone/mastoid process. Action: Bilateral neck extension. Unilateral lateral flexion and rotation of neck to same side

Splenius Cervicis

Origin: spinous processes of T3-T6. Insertion: transverse processes of C1-C3. Action: Bilateral neck extension. Unilateral neck lateral flexion to same side

Erector Spinae Group

Origin: common tendon that attaches to the posterior surface of sacrum, iliac crest, and spinous processes of T11-L5. Insertion: various attachments at posterior ribs, spinous and transverse processes of C2-T8, and mastoid process. Action: Bilateral trunk extension. Unilateral trunk lateral flexion to same side

Rectus Abdominus

Origin: pubic crest. Insertion: xiphoid process and costal cartilage of 5-7 ribs. Action: trunk flexion

External Oblique

Origin: lateral surface of lower 8 ribs. Insertion: iliac crest, pubic tubercle, and linea alba. Action: Bilateral trunk flexion. Unilateral trunk rotation to opposite side

Internal Oblique

Origin: inguinal ligament, iliac crest, and common tendon. Insertion: 8-12 ribs and linea alba. Action: Bilateral trunk flexion. Unilateral trunk rotation to same side

Quadratus Lumborum

Origin: iliac crest. Insertion: 12th rib and transverse processes of L1-L5. Action: Trunk lateral flexion to same side