BIOL 235 Assignment 2
Each question is worth 10 marks.
1. Name the type of joint, and list the movements permitted at the shoulder joint. Under each
movement’s name, list the names of the muscles responsible for each of these movements along with
descriptions of their bone insertion.
Answer:
The shoulder joint is a synovial ball and socket joint.
Flexion
-Clavicular head of Pectoralis major
o Greater tubercle and lateral lip of intertubular sulcus of humerus
-Anterior fibers of Deltoid
o Deltoid tuberosity of humerus
-Coracobrachialis
o Middle of medial surface of shaft of humerus
Extension
-Sternocostal head of Pectoralis major
o Greater tubercle and lateral lip of intertubular sulcus of humerus
-Latissimus Dorsi
o Intertubercular sulcus of humerus
-Posterior fibers of Deltoid
o Deltoid tuberosity of humerus
-Teres major
o Medial lip of intertubercular sulcus of humerus
-Teres minor
o Greater tubercle of humerus
Abduction
-Lateral fibers of Deltoid
o Deltoid tuberosity of humerus
-Supraspinatus (aids deltoid)
o Greater tubercle of humerus
Assignment 2 :: Biology 235: Human Anatomy and Physiology 1
, Adduction
-Pectorialis major
o Greater tubercle and lateral lip of intertubular sulcus of humerus
-Latissimus Dorsi
o Intertubercular sulcus of humerus
-Teres major (assists)
o Medial lip of intertubercular sulcus of humerus
-Coracobrachialis
o Middle of medial surface of shaft of humerus
Medial rotation
-Pectorialis major
o Greater tubercle and lateral lip of intertubular sulcus of humerus
-Latissimus Dorsi
o Intertubercular sulcus of humerus
-Anterior fibers of Deltoid
o Deltoid tuberosity of humerus
Subscapularis
o Lesser tubercle of humerus
-Teres majoro
o Medial lip of intertubercular sulcus of humerus
Lateral rotation
-Posterior fibers of Deltoid
o Deltoid tuberosity of humerus
-Infraspinatus
o Greater tubercle of humerus
-Teres minor
o Greater tubercle of humerus
2. What are EPSPs and IPSP, and how are they produced? Explain how these electrical currents are
used in spatial and temporal summation to initiate or inhibit the generation of an action potential.
Answer:
Assignment 2 :: Biology 235: Human Anatomy and Physiology 2
Each question is worth 10 marks.
1. Name the type of joint, and list the movements permitted at the shoulder joint. Under each
movement’s name, list the names of the muscles responsible for each of these movements along with
descriptions of their bone insertion.
Answer:
The shoulder joint is a synovial ball and socket joint.
Flexion
-Clavicular head of Pectoralis major
o Greater tubercle and lateral lip of intertubular sulcus of humerus
-Anterior fibers of Deltoid
o Deltoid tuberosity of humerus
-Coracobrachialis
o Middle of medial surface of shaft of humerus
Extension
-Sternocostal head of Pectoralis major
o Greater tubercle and lateral lip of intertubular sulcus of humerus
-Latissimus Dorsi
o Intertubercular sulcus of humerus
-Posterior fibers of Deltoid
o Deltoid tuberosity of humerus
-Teres major
o Medial lip of intertubercular sulcus of humerus
-Teres minor
o Greater tubercle of humerus
Abduction
-Lateral fibers of Deltoid
o Deltoid tuberosity of humerus
-Supraspinatus (aids deltoid)
o Greater tubercle of humerus
Assignment 2 :: Biology 235: Human Anatomy and Physiology 1
, Adduction
-Pectorialis major
o Greater tubercle and lateral lip of intertubular sulcus of humerus
-Latissimus Dorsi
o Intertubercular sulcus of humerus
-Teres major (assists)
o Medial lip of intertubercular sulcus of humerus
-Coracobrachialis
o Middle of medial surface of shaft of humerus
Medial rotation
-Pectorialis major
o Greater tubercle and lateral lip of intertubular sulcus of humerus
-Latissimus Dorsi
o Intertubercular sulcus of humerus
-Anterior fibers of Deltoid
o Deltoid tuberosity of humerus
Subscapularis
o Lesser tubercle of humerus
-Teres majoro
o Medial lip of intertubercular sulcus of humerus
Lateral rotation
-Posterior fibers of Deltoid
o Deltoid tuberosity of humerus
-Infraspinatus
o Greater tubercle of humerus
-Teres minor
o Greater tubercle of humerus
2. What are EPSPs and IPSP, and how are they produced? Explain how these electrical currents are
used in spatial and temporal summation to initiate or inhibit the generation of an action potential.
Answer:
Assignment 2 :: Biology 235: Human Anatomy and Physiology 2
