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Muscles Chart

Muscle names, origin, insertion, and action

Muscle NameOriginInsertionAction
Orbicularis Oris Maxillary Bone; Mandible Lips Closes and protrudes lips as in speaking, kissing, and whistling
Buccinator Maxillary Bone; Mandible Blends with Fibers of Orbicularis Oris Compresses cheek while whistling or blowing
Zygomaticus Major Zygomatic Bone Angle of Mouth Raises lateral corner of mouth for smiling
Zygomaticus Minor Zygomatic Bone Upper Lip Raises upper lip
Levator Labii Superioris Inferior Aspect of Bony Orbit Blends with Fibers of Orbicularis Oris Elevates upper lip; dilates nostrils
Depressor Anguli Oris Anterolateral Surface of Mandible Skin at Angle of Mouth Depresses angle of mouth
Mentalis Anterior Surface of Mandible Skin of Chin Protrudes lower lip; wrinkles skin at chin
Masseter Zygomatic Arch Lateral Surface of Mandibular Ramus Elevates mandible to close jaw; protrudes mandible
Temporalis Temporal Bone Coronoid Process of Mandible Elevates mandible to close jaw; retrudes mandible
Hyoglossus Hyoid Bone Tongue Depresses Tongue
Sternocleidomastoid Manubrium; Medial One-Third of Clavicle Mastoid process; occipital bone near mastoid process flexion and lateral flexion of neck; rotates head so that face is turned superiorly and to the opposite side
Mylohyoid Inferior Margin of Mandible at the Chin Hyoid Bone Elevates hyoid bone, tongue, and floor of mouth during swallowing and speaking
Sternohyoid Mandubrium Hyoid Bone Depresses larynx and hyoid bone during swallowing
Depressor Labii Inferioris Anterolateral surface of mandible Skin of lower lip Depresses lower lip
Thyrohyoid Thyroid cartilage of larynx Hyoid Bone Depresses hyoid bone; elevates larynx
Splenius Spinous processes of inferior cervical and superior thoracic vertebrae Mastoid Process, occipital bone and transverse process of superior cervical vertebrae Laterally flexes, rotates, and extends head and neck
Scalenes (Posterior, Middle, and Anterior) Transverse processes of cervical vertebrae First and second ribs Lateral flexion of neck, elevates ribs 1 and 2 during forced inspiration
Levator Scapulae Transverse processes of superior 4 cervical vertebrae Medial border of scapulae near superior angle Elevates scapula; inferior rotation of scapula
External Intercostals Inferior border of superior rib Superior border of inferior rib Elevates ribs during normal inspiration
Internal Intercostals Superior border of inferior rib Inferior border of superior rib Depresses the ribs during forced expiration
Rectus Abdominus Pubic crest; pubic symphysis Xiphoid process, costal cartilages of ribs 5-7 Flexion of vertebral column; stabilizes pelvis during walking, increases intraabdominal pressure during forced expiration
External Oblique External surfaces of superior 8 ribs Linea alba; pubic crest, pubic tubercle; iliac crest Rotation and lateral flexion of trunk; increases intraabdominal pressure during forced expiration
Internal Oblique Thoracolumbar fascia; iliac crest; inguinal ligament Linea alba; pubic crest; inferior 3 or 4 ribs Rotation and lateral flexion of trunk; increases intraabdominal pressure during forced expiration
Transversus Abdominis Thoracolumbar fascia; inguinal ligament; costal cartilages of inferior 6 ribs; iliac crest Linea alba; pubic crest Increases intraabdoninal pressure during forced expiration
Nasalis Maxilary Bone; Alar cartilage of Nose Bridge of Nose Compresses and dilates nostrils
Orbicularis Oculis Medial Aspect of Bony Orbit Skin around Eyelids Closes eyelid; acts during squinting and blinking
Created by: 1657000022