Lab practical II

Pectoantebrachialis (origin)

manubrium of sternum

Pectoantebrachialis (insertion)

antebrachium

Pectoantebrachialis (function)

adducts forelimb

Pectoralis major (origin)

sternum

Pectoralis major (insertion)

proximal humerus

Pectoralis major (function)

adducts and rotates humerus

Pectoralis minor(origin)

sternum

Pectoralis minor (insertion)

Humerus

Pectoralis minor (function)

adducts humerus

Xiphihumeralis (origin)

Median raphe

Xiphihumeralis (insertion)

humerus

Xiphihumeralis (function)

adducts humerus

External oblique (origin)

lumbodorsal fascia & last 8-9 ribs

External oblique (insertion)

linea alba

External oblique (function)

compresses the abdomen

internal oblique (origin)

lumbdodorsal fascia & ilium

internal oblique (insertion)

linea alba

internal oblique (function)

compresses the abdomen

transversus abdominus (origin)

posterior costal cartilages, lumbar vertebrae and ilium

transversus abdominus (insertion)

linea alba

transversus abdominus (function)

compresses the abdomen

rectus abdominus (origin)

pubis

rectus abdominus (insertion)

costal cartialges & sternum

rectus abdominus (function)

flexes the trunk

serratus ventralis (origin)

first 9 or 10 ribs &C3-C7

serratus ventralis (insertion)

vertebral border of scapula

serratus ventralis (function)

adducts scapula and supports trunk

Scalenes (origin)

second through 9th ribs

Scalenes (insertion)

cervical vertebrae

Scalenes (function)

laterally flex neck, protract ribs

transversus costarum (origin)

sternum

transversus costarum (insertion)

1st rib

transversus costarum (function)

protracts ribs

Intercostalis externus (origin)

ribs

Intercostalis externus (insertion)

adjacent caudel rib

Intercostalis externus (function)

protracts ribs

Intercostalis internus (origin)

ribs

Intercostalis internus (insertion)

adjacent cranial rib

Intercostalis internus (function)

retracts ribs

clavotrapezius (origin)

lambdoidal ridge and spine of axis

clavotrapezius (insertion)

clavicle and raphe with clavobrachialis

clavotrapezius (function)

protracts humerus

clavobrachialis (origin)

clavicle and raphe with clavotrapezius

clavobrachialis (insertion)

ulna

clavobrachialis (function)

flexes forearm

acromiotrapezius (origin)

spinous processes of C2-T4

acromiotrapezius (insertion)

metacromion process and spine of scapula

acromiotrapezius (function)

adduct scapula

Spinotrapezius (origin)

spinous processes of T1-T12

Spinotrapezius (insertion)

scapula

Spinotrapezius (function)

elevates and retracts scapula

Latissimus dorsi (origin)

spinous processes of T4 to L6

Latissimus dorsi (Insertion)

proximal humerus

Latissimus dorsi (Function)

retracts humerus

Sternomastoid (origin)

manubrium of sternum

Sternomastoid (insertion)

Lambdoidal ridge and mastoid process

Sternomastoid (function)

flexes or ratates head

Cleidomastoid (origin)

clavicle

Cleidomastoid (insertion)

mastoid process

Cleidomastoid (function)

rotates and laterally flexes head

Sternohyoid (origin)

sternum

Sternohyoid (insertion)

hyoid

Sternohyoid (Function)

retracts hyoid

Sternothyroid (origin)

sternum

Sternothyroid (insertion)

thyroid cartilage

Sternothyroid (function)

retracts larynx

thyrohyoid (origin)

thyroid cartilage

thyrohyoid (insertion)

hyoid

thyrohyoid (funciton)

protacts larynxthyrohyoid (

stylohyoid (origin)

lesser horn of hyoid

stylohyoid (insertion)

body of hyoid

stylohyoid (function)

elevates hyoid

Mylohyoid (origin)

mandible

Mylohyoid (insertion)

median raphe

Mylohyoid (function)

elevates floor of mouth

Geniohyoid (origin)

mandible

Geniohyoid (insertion)

hyoid

Geniohyoid (function)

protracts hyoid

Genioglossus (origin)

mandible near symphysis

Genioglossus (insertion)

tongue

Genioglossus (function)

protracts tongue

Hyoglossus (origin)

hyoid

Hyoglossus (insertion)

tongue

Hyoglossus (function)

retracts and depresses tongue

Styloglossus (origin)

mastoid process

Styloglossus (insertion)

tongue

Styloglossus (function)

retracts and elevates tongue

Rhomboideus capitis (origin)

lambdoidal ridge

Rhomboideus capitis (insertion)

scapula

Rhomboideus capitis (function)

protracts scapula

Rhomboideus cervicis et thoracis (origin)

vertebrae T1-T4

Rhomboideus cervicis et thoracis (insertion)

scapula

Rhomboideus cervicis et thoracis (function)

adducts scapula

splenius (origin)

vertebrae C1-C7

splenius (insertion)

occipital bone

splenius (function)

extends head

masseter (origin)

zygomatic arch

masseter (insertion)

masseteric fossa

masseter (function)

elevates mandible

Temporalis (origin)

temporal bone