Summary Muscles of upper & lower limbs & brachial plexus
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Course
Musculoskeletal module
Institution
Kafrelsheikh University
Muscles and nerves of both upper and lower limbs made easy in comparison tables. Each table discribes muscle origin, insertion, action, nerve supply and a picture of the muscle.
Muscle Pectoralis major Pectoralis minor Subclavius
- Clavicular head originates 1st costal cartilage near the
from medial half of clavicle. rib.
Origin - Sternocostal head originates 3,4,5 ribs. (the costochondral junction)
from lateral surface of sternum
& upper six costal cartilages.
Insertion Lateral lip of bicipital groove. Coracoid process. Subclavius groove.
(at inferior surface of the clavicle).
Two heads: Adduction & medial rotation. -In case of movement of insertion: Steadiness of clavicle during
this muscle helps in respiration. Protraction (draws scapula downwards movement of the shoulder joint.
Action Clavicular head:
flexion & adduction of arm.
&forwards). ()ﻟﻣﺎ ﺑﻣد ﻛﺗﻔﻲ ﻟﻘدام.
-In case of movement of origin:
Sternocostal head: Elevation of ribs (in forced respiration).
adduction & medial rotation of arm.
Nerve From brachial plexus 2 nerves :
-Medial pectoral nerve.
From brachial plexus:
-Medial pectoral nerve.
From brachial plexus:
nerve to subclavius.
supply -Lateral pectoral nerve.
Atlas
, Lec2: muscles of back.
Muscle TRAPEZIUS LATISSIMUS DORSI LEVATOR SCAPULAE RHOMBOIDEUS MINOR RHOMBOIDEUS MAJOR
1. Medial 1/3 of superior 1. Spines & supraspinous
nuchal line. ligaments of lower 6 thoracic
Transverse processes of 1)Lower part of ligamentum Spines and supraspinous
2. External occipital vertebrae.
nuchae. ligaments of:
Origin upper 4 cervical
2. Posterior layer of
protuberance.
thoracolumbar fascia. 2)spines of: 7th cervical and 2,3,4,5 thoracic vertebrae.
3. Ligamentum nuchae. 3. Posterior part of outer lip of vertebrae 1st thoracic vertebrae.
4. Spines & supraspinous iliac crest.
ligaments of: 7th cervical and 4. Lower 4 ribs.
all thoracic vertebrae 5. Back of inferior angle of
scapula.
1. Upper fibers: Posterior
border of lateral 1/3 of Back of Back of Back of
clavicle.
Floor of intertubercular= medial border of scapula, medial border of scapula, medial border of scapula,
Insertion 2. Middle fibers: Medial
margin of acromion and
superior lip of spine of
(bicipital) groove of the
humerus.
from superior angle to
root of its spine
opposite root of the spine from root of the spine to
inferior angle of scapula
scapula.
3. Lower fibers: Tubercle of
spine of scapula.
1. Upper fibers:
Elevation of shoulder Powerful:
girdle. 1)adduction. 1) Elevation Retraction of the Retraction of the
Action 2. Middle fibers: 2)extension.
3)medial rotation.
2) retraction shoulder shoulder
Retraction of scapula.
of the arm at the shoulder
of the scapula
3. Lower fibers: joint
Depression of scapula.
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