MBI Muscle Group 1

Muscle contraction without joint movement.

Muscle contraction with joint movement.

Origin and Insertion get closer together.

Origin and Insertion get farther apart.

MASSETERO: Zygomatic ArchI: Angle of mandible, Ramus of mandible.A: Elevate the mandible at the tempromandibular joint.What joint does it cross?TemporomandibularWhat is possible at the joint? Depression, Elevation, Protraction, Retraction

STERNOCLEIDOMASTOIDO: Clavicle-medial 1/3, Sternum-ManubriumI: Mastoid ProcessA: Flexion of the head at cervical joint, Rotation of head at cervical joint to opposite side, Lateral Flexion of head at cervical joint to same side, Elevate rib cage on inhalation.What joint does it cross? CervicalWhat is possible at the joint?Rotation, Flexion, Lateral Flexion, Extension

TEMPORALISO: Temporal Fossa and FasciaI: Coronoid process and anterior edge of ramus of the mandible.A: Elevate the mandible at the temporomandibular joint, Retract the mandible at the TM joint.What joint does it cross?TemporomandibularWhat is possible at the joint?Depression, Elevation, Retraction, Protraction

OCCIPITOFRONTALISO: Galea aponeuroticaI: Surpaorbital ridge, Occipital ridgeA: Raise the eyebrows and wrinkle the forehead.What joint does it cross? None

SCALENESO: Transverse Process C2-C7I: Ribs 1 & 2 Anterior, Middle, PosteriorWhat joint does it cross? CervicalWhat is possible at the joint?Rotation, Flexion, Lateral Flexion, Extension

SPINALIS- Erector Spinae GroupO: Spinous Process L3-T6 & C7I: Spinous Process T1-T5 & C2-C6What joint does it cross? CervicalWhat is possible at the joint?Flexion, Extension, Lateral Flexion, Rotation.

LONGISSIMUS- Erector Spinae GroupO: Transverse Process T1-T5I: Mastoid Process, Ribs 4-12, Transverse Process T1-T12 & C1-C7What joint does it cross? CervicalWhat is possible at the joint?Flexion, Extension, Lateral Flexion, Rotation

ILIOCOSTALIS-Erector Spinae GroupO: Ribs 1-12, Lumborum TendonI: Transverse Process C5-C7, TP L1-L3, Ribs 1-12What joint does it cross? CervicalWhat is possible at the joint?Flexion, Extension, Lateral Flexion, Rotation

Quadratus LumborumO: Posterior iliac crestI: 12th Rib, Transverse Process L1-L4A: Lateral flexion of the trunk @ vertebral column same side, Extension of the trunk @ vertebral column..What joint does it cross? Vertebral Column

Rectus Abdominis
O: Pubic crest, pubic symphosisI: Xyphoid process, costal cartilage of 5th, 6th and 7th ribs.A: Flexion of the trunk @ vertebral column, Posterior tilt of pelvis.

_{External Oblique}O: Ribs 5-12I: Abdominal aponeurosis, linea alba, iliac crest.A: Lateral flexion of trunk @ vertebral column same side, Flexion of trunk @ vertebral column same side, Rotation of trunk @ vertebral column same side.