Muscles of the Thorax/Neck/Abdoment and The Lumbosacral Plexus

Anterior Thorax

• Intercostal Muscles

• Serratus Anterior

Intercostal Muscles

• Action: External intercostal: elevates the rib cage, spreading the ribs, assisting in inspiration internal intercostal: depresses the rib cage, pulling ribs closer together, assisting experiation

• Innervation: Intercostal

• Origin: N/a

• Insertion: N/A

Serratus Anterior

• Action: Scapular Protraction, and upward scapular rotation

• Innervation: Long thoracic nerve

• Origin: First Nine ribs

• Insertion: Medial Border of scapula

Posterior Thorax

• Serratus Posterior Superior

• Serratus Posterior Inferior

• Splenius Capitis

• Splenius Cervicis

• Iliocostalis (cervicis, thoracis, lumborum) (lateral column)

• Longissimus (thoracis, cervicis, capitis) (intermediate column)

• Spinalis (medial column)

• Semispinalis (capitis, cervicis, thoracis

Serratus Posterior Superior

• Action: Elevates ribs

• Innervation: Intercostal

• Origin:

• Insertion:

Serratus Posterior Inferior

• Action: Depresses ribs

• Innervation: Intercostal

• Origin:

• Insertion:

Splenius Capitis

• Action: Bilaterally: neck extension. Unilaterally: ipsilateral lateral flexion, and ipsilateral head rotation

• Innervation: Dorsal Rami

• Origin: 

• Insertion:

Splenius Cervicis

• Action: Bilaterally: Extend cervical spine. Unilaterally: Ipsilateral lateral flexion and rotation of cervical spine

• Innervation: Dorsal Rami

• Origin:

• Insertion:

Iliocostalis (Cervicis, thoracis, lumborum) (lateral column)

• Action: Extend and ipsilateral lateral flexion of bertebral column

• Innervation: Dorsal Rami

• Origin:

• Insertion:

Longissimus (thoracis, cervicis, capitis) (intermediate column)

• Action: Extend the vertebral column (particularly thoracis), an ipsilateral lateral flexion of vertebral column

• Innervation:

• Origin:

• Insertion:

Spinalis (medial column)

• Action: Extend the vertebral column

• Innervation: Dorsal Rami

• Origin:

• Insertion:

Semispinalis (capitis, cervicis, thoracis)

• Action: Extend the vertebral column capitis and cervicis, extend the head, and contralateral trunk/head rotation

• Innervation: Dorsal Rami

• Origin: Transverse Processes

• Insertion: Spinous Processes

Muscles of the Anterior Neck

Sternocleidomastoid

Scalenes

Sternocleidomastoid

• Action: Bilaterally: Flex head. Unilaterally: Flex and contralateral rotation. The accessory muscle of respiration

• Innervation: Spinal Accessory Nerve

• Origin: Manubrium of sternum, medial portion of clavicle

• Insertion: Mastoid process of temporal bone

Scalenes

• Action: Elevates first two ribs, neck flexion

• Innervation: Cervical spinal nerves

• Origin:

• Insertion:

Muscles of the Abdomen

• Rectus Abdominis

• External Abdominal Oblique

• Internal Abdominal oblique

• Transversus abdominis

Linea Alba

White line down the middle

Rectus Abdominis

• Action: Flexes the trunk depresses ribs

• Innervation: Intercostal

External Abdominal Oblique

• Action: Compresses abdomen, trunk ipsilateral lateral flexion, contralateral trunk rotation, active in forced expiration

• Innervation: Intercostal

Internal Abdominal Oblique

• Action: Compresses abdomen, trunk ipsilateral lateral flexion, ipsilateral trunk rotation, active in forced expiration

• Innervation: Intercostal

Transversus Abdominis

• Action: Compresses abdominal Cavity

• Innervation: Intercostal

Lumbo Sacral Plexus

Lumbo Sacral Plexus Cadaver

Arculate Line

idefk

Rectus Aponosis (Rectus Sheathe)

Covering for the fucking uhhh 8pack