60
Biology of Sea Turtles, Vol. II
TABLE 2.1
Major Muscles of Sea Turtles: Locations and Innervations
Muscle
Origin
Insertion
Innervation
Pectoral Muscles
Pectoralis major
Plastron
Lateral process and shaft of the
humerus
Supracoracoid nerve
(ventral brachial plexus)
Deltoideus (ventral part)
Ventral scapula, acromion, and
anterior plastron bones
Lateral process of the humerus
Supracoracoid nerve
(ventral brachial plexus)
Supracoracoideus (anterior part)
Acromion
Lateral process of the humerus
Supracoracoid nerve
(ventral brachial plexus)
Biceps brachii (superficial head) a
Posterior coracoid
Via a long tendon to radius and ulna;
sometimes pisiform of wrist
Inferior brachial nerve
(median nerve)
Biceps brachii (profundus head)
Posterior coracoid ventral to the biceps
superficialis
Via a tendon with the brachialis on
radius and ulna
Inferior brachial nerve
(median nerve)
Brachialis inferior
Distal humerus
With the biceps brachii profundus on
radius and ulna
Inferior brachial nerve
Flexor carpi ulnaris
Ulnar epicondyle, humerus, ulnar
border
Pisiform, skin of ulnar side of flipper
blade
Median nerve
Flexor digitorum longus and palmaris
longus
Humerus, ulna, and ulnar epicondyle
Ventral surface of the flipper
phalanges
Median nerve
Flexor carpi radialis
Ulnar epicondyle
Radius and metacarpal I
na
Coracobrachialis magnus
Dorsal side of coracoid process
Medial process of the humerus
Supracoracoid nerve
Supracoracoideus (posterior part)
Procoracoid and coracoid cartilage
Lateral process of the humerus
Supracoracoid nerve
Latissimus dorsi/teres major
complex
Scapula and carapace from scapular
ligament, along first pleural bone to
anterior peripheral bone
Via a common tendon just distal to the
head of the humerus
Deltoid nerve
(brachial plexus)
Deltoideus
(scapular head)
Anterior scapula
Lateral process and shaft of the
humerus
Deltoid nerve
(brachial plexus)
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