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Anatomy of the Back and Shoulder Muscles: Their Functions and Bones of Origin, Exercises of Biology

An overview of the muscles in the back and shoulder region, their functions, and the bones from which they originate. The muscles listed include the latissimus dorsi, levator scapulae, infraspinatus, teres major, spinotrapezius, rhomboideus, clavotrapezius, acromiotrapezius, and more. Understanding the functions and origins of these muscles is essential for medical students and healthcare professionals.

What you will learn

  • What muscles are involved in pulling the arm caudodorsally?
  • Which bone does the infraspinatus fossa belong to?
  • Which muscle turns and elevates the head?

Typology: Exercises

2021/2022

Uploaded on 09/12/2022

laskhminaran
laskhminaran 🇺🇸

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bg1
Name
Origin
Insertion
Action
Latissimus dorsi
Vertebrae
Humerus
Pulls arm
caudodorsally
Levator scapulae
ventralis
Occipital bone
Infraspinatus
fossa
Draws scapula
cranially
Splenius
Mid-dorsal
fascia line
Skull
Turns and
elevates head
Spinotrapezius
Thoracic
vertebrae
Scapula
Draws scapula
dorsally
Teres major
Scapula
Humerus
Flexes and
rotates humerus
Spinodeltoid
Scapula
Humerus
Flexes and
rotates humerus
Rhomboideus
capitus
Skull
Scapula
Draws scapula
cranially
Clavotrapezius
Skull
Clavicle
Draws scapula
craniodorsally
Acromiotrapezius
Cervical
vertebrae
Scapula
Draws scapula
dorsally
Rhomboideus
Thoracic
vertebrae
Scapula
Draws scapula
dorsally
Clavobrachialis
Clavicle
Ulna
Flexes forearm
Infraspinatus
Infraspinatus
fossa
Humerus
Rotates humerus
Supraspinatus
Supraspinatus
fossa
Humerus
Extends arm
Acromiodeltoid
Scapula
Spinodeltoid
Flexes and
rotates humerus
DORSAL MUSCLE O.I.A
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Name Origin Insertion Action

Latissimus dorsi Vertebrae^ Humerus^ Pulls arm

caudodorsally

Levator scapulae

ventralis

Occipital bone Infraspinatus fossa Draws scapula cranially

Splenius Mid-dorsal

fascia line Skull Turns and elevates head

Spinotrapezius Thoracic

vertebrae Scapula Draws scapula dorsally

Teres major Scapula^ Humerus^ Flexes and

rotates humerus

Spinodeltoid Scapula^ Humerus^ Flexes and

rotates humerus

Rhomboideus

capitus

Skull Scapula Draws scapula cranially

Clavotrapezius Skull^ Clavicle^ Draws scapula

craniodorsally

Acromiotrapezius Cervical

vertebrae Scapula Draws scapula dorsally

Rhomboideus Thoracic

vertebrae Scapula Draws scapula dorsally

Clavobrachialis Clavicle^ Ulna^ Flexes forearm

Infraspinatus Infraspinatus

fossa Humerus Rotates humerus

Supraspinatus Supraspinatus

fossa Humerus Extends arm

Acromiodeltoid Scapula^ Spinodeltoid^ Flexes and

rotates humerus DORSAL MUSCLE O.I.A