QuestionSBA
QuestionChoice
Flat muscles consist of parallel fibres within an aponeurosis. The fascicles/fibres in the deltoids are arranged obliquely, not in parallel, and so they are flat muscles.
10000535
e
Flat
QuestionChoice
Whilst the deltoid muscles do have a pennate structure, with the fascicles sitting obliquely to the tendon, they have four fascicles rather than two, so are known as 'multipennate' rather than 'bipennate'.
10000533
c
Bipennate
QuestionChoice
The deltoid muscles have a multipennate structure, with many feather-like fascicles originating from various points (e.g. clavicle, acromion, and spine of scapula) which then converge and insert onto a singular central point (the deltoid tuberosity).
10000531
a
Multipennate
QuestionChoice
Circular muscles are exactly what they sound like - circular! They are concentrically arranged fascicles which increase and decrease the size of an opening. The fascicles of the deltoids are not arranged concentrically, and so the deltoids are not circular muscles.
10000534
d
Circular
QuestionChoice
Deltoid muscles may appear fusiform (spindle-shaped) at first-glance. However, the arrangement of fascicles in an oblique pattern means that they are classified as pennate, and the number of fascicles means that they are 'multipennate'.
10000532
b
Fusiform
Concept
Chapter
2693
3783
Types of muscle
Topic
154
Musculoskeletal physiology and disease
12653
Which of the following is the correct classification of muscle for the deltoid?
a