Muscles trunk Flashcards
Rectus abdominis
- Origin: pubic crest
- Insertion: Xiphoid process,
- Function: Trunk flexion
Transversus abdominis
- Origin: Internal surfaces of costal cartilages of ribs 7-12,
- Insertion: pectinal line of pubis
- Function: Bilateral contraction - Compresses abdominal viscera
Unilateral contraction - Trunk rotation
External obliques
- Origin: External surfaces of ribs 5-12
- Insertion: Linea alba
- Function: Trunk flexion
- Nerve Supply: Intercostal nerves
Internal obliques
- Origin: Anterior two-thirds of iliac crest
- Insertion: Inferior borders of ribs 10-12,
- Function: Trunk flexion
Quadratus lumborum
- Origin: Iliac crest,
- Insertion: Inferior border of rib 12,
- Function: fixes Ribs 12 during inspiration
Spinalis capitis
- Origin: originates from the spinous processes of C7-T1 vertebrae
- Insertion: into the midline of the occipital bone.
- Function: extend and laterally flex the cervical and thoracic regions of the spine.
Spinalis colli
- Origin: originates from the spinous processes of C7-T1 vertebrae
- Insertion: to the spinous processes of C2-C4 vertebrae.
- Function: extend and laterally flex the cervical and thoracic regions of the spine.
Spinalis thoracis
- Origin: the spinous process of T11-L2 vertebrae
- Insertion:
- Function: extend and laterally flex the cervical and thoracic regions of the spine.
Sternocleidomastoid
- Origin: superior part of anterior surface of manubrium sterni
- Insertion: Lateral surface of mastoid process of the temporal bone,
- Function: neck ipsilateral flexion,
Scalene muscles - anterior
- Origin: anterior tubercle of transverse processes of vertebrae C3-C6
- Insertion: scalene tubercle of rib 1,
- Function: neck flexion
Scalene muscles – medial
- Origin: transverse processes of C1/C2 -> C7
- Insertion: superior border of rib 1
- Function: neck lateral flexion
Scalene muscles – posterior
- Origin: posterior tubercles of transverse processes of vertebrae C4-C6/C5-C7
- Insertion: external surface of rib 2
- Function: neck lateral flexion
Semispinalis capitis
- Origin: Articular processes of vertebrae C4-C7,
- Insertion: Between superior and inferior nuchal lines of occipital bone
- Function: extension of head,
Semispinalis cervicus
- Origin: Transverse processes of vertebrae T1-T6
- Insertion: Spinous processes of vertebrae C2-C5
- Function: Extension of head
Splenius capitis
- Origin: Spinous processes of vertebrae C7-T3,
- Insertion: Lateral superior nuchal line of occipital bone,
- Function: Extends head/neck
Longus capitus
- Origin: Anterior tubercles of transverse processes of C3-C6
- Insertion: Basilar part of occipital bone
- Function: head flexion;
Longus colli
- Origin: Anterior tubercles of transverse processes of vertebrae
- Insertion: Anterior tubercle of vertebra
- Function: Neck flexion
(Iliocostalis Muscle Group)
Iliocostalis colli (cervicis)
Iliocostalis thoracis
Iliocostalis lumborum
(Longissimus Muscle Group)
Longissimus capitis
Longissimus colli (cervicis)
Longissimus Thoracis
(Spinalis muscle group)
Spinalis capitis
Spinalis colli (cervicis)
Spinalis Thoracis
Longissimus capitis
- Origin: transverse processes of vertebrae C4-T5
- Insertion: inserts into the mastoid process of temporal bone.
- Function: to extend and laterally flex (ipsilateral) the spine.
Longissimus colli
- Origin: extends between the transverse processes of vertebrae T1-T5 and transverse processes of vertebrae C2-C6.
- Function:to extend and laterally flex (ipsilateral) the spine.
Longissimus thoracis
- Origin: travels from the L1-L5 vertebrae, sacrum and posterior iliac crest until the thoracic vertebrae and inferior six ribs.
- Function: to extend and laterally flex (ipsilateral) the spine.
Iliocostalis colli
- Origin: the angle of ribs 3 to 6
- Insertion: inserts into the transverse processes of vertebrae C4-C6.
- Function: extend and laterally flex (ipsilateral) the spine.
Iliocostalis lumborum
- Origin: lateral crest of sacrum, medial end of iliac crest and thoracolumbar fascia.
- Insertion: attaches to the angle of ribs 5-12
- Function: extend and laterally flex (ipsilateral) the spine.
Iliocostalis thoracis
- Origin: muscle arises from the angles of ribs 7-12
- Insertion: angles of ribs 1-6
- Function: extend and laterally flex (ipsilateral) the spine.