Pectoalis major & minor, serratus anterior, subclavius, levatore scapulae, rhomboideus minor & major, and trapezius

Muscles of Upper Arm and Shoulder Pectoralis major and minor:

Major: large fan-like Originates sternum and clavicle Inserts in humerous (shoulder) Elevates sternum

Minor: Originates ribs 2-5 Insert in caracoid process of scapula Deep to pectoralis major

Muscles of Upper Arm and Shoulder Serratus anterior:

Originate ribs 1-9 Insert in scapula

Subclavius: Originates clavicle Insert in first rib

Levator scapulae: Originate C1-C4 Insert in scapula

Muscles of Upper Arm and Shoulder Rhomboideus major and minor

Major: Originate T2-T5 Insert in scapula

Minor: Originate C7 and T1 Insert in scapula

Provide stability for shoulder girdle

Muscles of Upper Arm and Shoulder Trapezius:

Originate from C2-T12 Insert into scapula and clavicle

Generally, accessory muscles support and protect thoracic cavity.

Review

Inspiration muscles: Primary:

Diaphragm Accessory:

Muscles of thorax: anterior and posterior Muscles of neck Muscles of upper arm and shoulder

Muscles of Thorax, Back, and Upper LimbsAbdominal Muscles

Anterior and Posterior

Anterior

Internal intercostals: Origination ribs 2-12 Insert ribs 1-11 Deep to external intercostals

Innermost intercostals: Same origination and insertion as internal

intercostals. Deepest intercostals Not found in chondral portion

Anterior

Transversus thoracis: Originates on sternum Inserts in ribs 2-6

Subcostals and Serratus posterior inferior

Posterior

Subcostals: Run parallel to internal intercostals May span more than one rib

Serratus posterior inferior: Originates on T11-L3 Inserts in ribs 7-12

Anterolateral and Posterior Muscles

Anterolateral

Transversus abdominis: Deepest of the anterior abdominal

muscles Originates from vertebral column Inserts in aponeurosis, ribs 6-12, and

pubis Internal oblique abdominis:

Originates from pelvic girdle Inserts in lower ribs and aponeurosis

Anterolateral

External oblique abdominis: Most superficial and largest Originate ribs 5-12 Insert in pelvic girdle and etc.

Rectus abdominis: Originate pubis Insert sternum and ribs “six pack”

Posterior

Quadratus lumborum: Originate from pelvic girdle Insert in lumbar vertebrae

Latissimus dorsi

Upper Limb

Latissimus dorsi: Originates from lower vertebrae Insert into humerous Role in expiration only suspected

Review

Inspiration Diaphragm and accessory

Expiration Thoracic and abdominal