Bio 228 Chapter 12- Head, Neck, and Trunk

Epicranius

Frontal belly

Occipital belly

Orbicularis Oculi

Levator Labii

Zygomaticus

Orbicularis Oris

Mentalis

Muscle, Origin, and Insertion

Messeter- Closes jaw

Origin- Zygomatic arch and Zygomatic bone

Insertion- Angle and ramus of Mandible

Temporalis

Buccinator

Platysma

Sternocleidomastoid

Digastric

Muscle, Origin, and Insertion

Mylohyoid- Elevates Hyoid bone and floor of mouth

Origin- Medial surface of Mandible

Insertion- Hyoid bone and median Raphe

Sternohyoid

Sternothyroid

Muscle, Origin, and Insertion

Rectus Abdominus- Flexes vertebral column

Origin- Pubic crest and symphysis

Insertion- Xiphoid process and costal cartileges of ribs 5-7

External Oblique

Internal Oblique

Transverse Abdominus

Trapezius

Muscle, Origin, and Insertion

Latissimus dorsi- Prime mover of arm extension

Origin- Indirect attachment to spinous processes of lower six thoracic vertebrae

Insertion- Floor of intertubercular sulcus of humerus

Infraspinatus

Supraspinatus

Muscle, Origin, and Insertion

Levator Scapulae- Elevates and adducts Scapula

Origin- Transverse processes of C1-C4

Insertion- Medial border of Scapula superior to spine

Rhomboid minor

Rhomboid major

teres minor

Teres major

Semispinalis Capitis

Semispinalis Cervicis

Semispinalis Thoracis

Semispinalis as a whole action, origin, and insertion

Action- Acting together, extend head and vertebral column

Origin- Transverse processes of C7-T12

Insertion- Occipital bone and spinous processes of cervical vertebrae and T1-T4

Iliocostalis

Longissimus

Spinalis

Muscle, Origin, and Insertion

Erector Spinae- Extend and laterally flex the vertebral column

Origin- Iliac crest, transverse processes of lumbar

Insertion- Ribs and transverse processes of vertebrae about six segments above origin.

Splenius capitis

Splenius cervicis