Lab Exam 1 - AOIs Flashcards
Obliques (external and internal)
Muscle group - Abdominal wall
Action - Compression of abdomen, flexion, and rotation of trunk
Origin - Ribs (external), iliac crest (internal)
Insertion - Iliac crest (external), ribs (internal);
Both
Transverse abdominis
Muscle group - Abdominal wall
Action - Compression of abdomen
Origin - Ribs and iliac crest
Insertion - Linea alba
Both
Rectus abdominus
Muscle group - Abdominal wall
Action - Flexion of trunk; compression of abdominal wall
Origin - Public crest
Insertion - Xiphoid process and ribs (5-7)
Both
Intercostals (external and internal)
Muscle group - Breathing muscles
Action - Elevation and depression of ribs
Origin - Superior border of ribs (external); inferior border of ribs (internal)
Insertion - Inferior border of ribs (external); superior border of ribs (internal)
Both
Diaphragm
Muscle group - Breathing muscles
Action - Opens thoracic cavity for lungs during inhalation
Origin - Ribs (5-10) and lumbar vertebrae
Insertion - Central tendon
Both
Frontalis
Muscle group - Muscles of the scalp
Action - Raises eyebrows
Origin - Epicranial aponeurosis
Insertion - Skin of eyebrows and root of nose
Human
Occipitalis
Muscle group - Muscles of the scalp
Action - Pulls scalp posteriorly
Origin - Occipital bone
Insertion - Epicranial aponeurosis
Human
Temporalis
Muscle group - Mastication
Action - Closes jaw; retracts mandible
Origin - Temporal fossa
Insertion - Coronoid process (mandible)
Human
Masseter
Muscle group - Mastication
Action - Closes jaw
Origin - Zygomatic arch
Insertion - Angle and ramus (mandible)
Both
Zygomaticus
Muscle group - Facial expression
Action - Elevates corners of mouth
Origin - Zygomatic bone
Insertion - Corner of mouth
Human
Buccinator
Muscle group - Facial expression
Action - Compression of cheek
Origin - Molar region (maxilla and mandible)
Insertion - Orbicularis oris
Human
Platysma
Muscle group - Facial expression
Action - Tenses skin of neck; depression of lower lip
Origin - Fascia of chest
Insertion - Mandible and corner of mouth
Human
Orbicular oculi
Muscle group - Facial expression
Action - Closes eyes
Origin - Frontal bone and maxilla
Insertion - Eyelids
Human
Orbicular oris
Muscle group - Facial expression
Action - Closes and protrudes lips
Origin - Maxilla and mandible
Insertion - Angles of mouth
Human
Levator labii superioris
Muscle group - Facial expression
Action - Elevation of upper lip
Origin - Zygomatic bone and infraorbital margin (maxilla)
Insertion - Upper lip
Human
Depressor labii inferioris
Muscle group - Facial expression
Action - Depression of lower lip
Origin - Body of mandible
Insertion - Lower lip
Human
Sternocleidomastoid
Muscle group - Anterolateral neck
Action - Flexion and rotation of neck
Origin - Manubrium and clavicle
Insertion - Mastoid process (temporal bone)
Both
Scalenes
Muscle group - Anterolateral neck
Action - Elevation of ribs 1 & 2; rotation of neck
Origin - Transverse processes of cervical vertebrae (C3-C7)
Insertion - Ribs 1-2
Both
Serratus anterior
Muscle group - Anterior thorax
Action - Abduction and rotation of scapula
Origin - True ribs
Insertion - Medial border (scapula)
Both
Rhomboids
Muscle group - Anterior thorax
Action - Adduction and elevation of scapula
Origin - Spinous processes of vertebrae (C7-T5)
Insertion - Medial border (scapula)
Both
Splenius
Muscle group - Intrinsic muscles of back
Action - Rotation of head; extension of neck
Origin - Spinous processes of vertebrae (C7-T6)
Insertion - Temporal and occipital bone
Both
Diagastric
Muscle group - Anterior neck (Suprahyoid)
Action - Elevation of hyoid; opens mouth
Origin - Lower margin (mandible); mastoid process (temporal bone)
Insertion - Hyoid bone
Both
Mylohyoid
Muscle group - Anterior neck (Suprahyoid)
Action - Elevation of hyoid and floor of mouth
Origin - Medial surface (mandible)
Insertion - Hyoid bone
Both
Geniohyoid
Muscle group - Anterior neck (Suprahyoid)
Action - Elevation and protraction of hyoid bone
Origin - Mental tubercle
Insertion - Hyoid bone
Both
Sternohyoid
Muscle group - Anterior neck (Infrahyoid)
Action - Depression of hyoid and larynx
Origin - Manubrium (sternum)
Insertion - Hyoid bone
Both
Sternothyroid
Muscle group - Anterior neck (Infrahyoid)
Action - Depression of hyoid and larynx
Origin - Manubrium (sternum)
Insertion - Thyroid cartilage
Both
Thyrohyoid
Muscle group - Anterior neck (Infrahyoid)
Action - Depression of hyoid; elevation of larynx
Origin - Thyroid cartilage
Insertion - Hyoid bone
Both
Abdominal wall
External obliques
Internal obliques
Transverse abdominis
Rectus abdominis
Common action is compression of abdomen