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Opposition and reposition

Opposition is the thumb movement that brings the tip of the thumb in contact with the tip of a finger. This movement is produced at the first carpometacarpal joint, which is a saddle joint formed between the trapezium carpal bone and the first metacarpal bone. Thumb opposition is produced by a combination of flexion and abduction of the thumb at this joint. Returning the thumb to its anatomical position next to the index finger is called reposition    (see [link] l ).

Movements of the Joints
Type of Joint Movement Example
Pivot Uniaxial joint; allows rotational movement Atlantoaxial joint (C1–C2 vertebrae articulation); proximal radioulnar joint
Hinge Uniaxial joint; allows flexion/extension movements Knee; elbow; ankle; interphalangeal joints of fingers and toes
Condyloid Biaxial joint; allows flexion/extension, abduction/adduction, and circumduction movements Metacarpophalangeal (knuckle) joints of fingers; radiocarpal joint of wrist; metatarsophalangeal joints for toes
Saddle Biaxial joint; allows flexion/extension, abduction/adduction, and circumduction movements First carpometacarpal joint of the thumb; sternoclavicular joint
Plane Multiaxial joint; allows inversion and eversion of foot, or flexion, extension, and lateral flexion of the vertebral column Intertarsal joints of foot; superior-inferior articular process articulations between vertebrae
Ball-and-socket Multiaxial joint; allows flexion/extension, abduction/adduction, circumduction, and medial/lateral rotation movements Shoulder and hip joints

Chapter review

The variety of movements provided by the different types of synovial joints allows for a large range of body motions and gives you tremendous mobility. These movements allow you to flex or extend your body or limbs, medially rotate and adduct your arms and flex your elbows to hold a heavy object against your chest, raise your arms above your head, rotate or shake your head, and bend to touch the toes (with or without bending your knees).

Each of the different structural types of synovial joints also allow for specific motions. The atlantoaxial pivot joint provides side-to-side rotation of the head, while the proximal radioulnar articulation allows for rotation of the radius during pronation and supination of the forearm. Hinge joints, such as at the knee and elbow, allow only for flexion and extension. Similarly, the hinge joint of the ankle only allows for dorsiflexion and plantar flexion of the foot.

Condyloid and saddle joints are biaxial. These allow for flexion and extension, and abduction and adduction. The sequential combination of flexion, adduction, extension, and abduction produces circumduction. Multiaxial plane joints provide for only small motions, but these can add together over several adjacent joints to produce body movement, such as inversion and eversion of the foot. Similarly, plane joints allow for flexion, extension, and lateral flexion movements of the vertebral column. The multiaxial ball and socket joints allow for flexion-extension, abduction-adduction, and circumduction. In addition, these also allow for medial (internal) and lateral (external) rotation. Ball-and-socket joints have the greatest range of motion of all synovial joints.

Watch this video to learn about anatomical motions. What motions involve increasing or decreasing the angle of the foot at the ankle?

Dorsiflexion of the foot at the ankle decreases the angle of the ankle joint, while plantar flexion increases the angle of the ankle joint.

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Questions & Answers

please guys help me to answer this question; Define the two divisions of the skeleton ?
Jonathan Reply
two example of appendicular skeleton
Jonathan
upper limb ;eg humerus n lower limb;eg tibia
BRIAN
write notes on the level of organizations of the body .citing examples for each level
Kaddijatou Reply
Jonathan Nyakpaab
Jonathan
what is pathology
Ericka Reply
1 What is Nasogastric Tube 2 what is the difference between Nasogastric Aspiration and Nasogastric Feeling
ONOJA Reply
You measure a patient’s blood pressure at 130/85. Calculate the patient’s pulse pressure and mean arterial pressure. Determine whether each pressure is low, normal, or high.
ONOJA
normal blood pressure 120/80
Mohd
what are nocciceptors
Soul
hfjfjcjjjghkbv
Mohd
1 Its a flexible tube of plastic that pass through the nose, down to the eausophagus, and into the stomach, used to add or remove substances in the stomach.
Andile
2 Nasogastric aspiration is process of draining stomach contents via a tube and Nasogastric feeding is a process of giving food liquid through nasogastric tube
Andile
andile sir what is meant by clonoscopy
Soul
colonoscpopy is an exam use to detect abnormalities in the small intestine or the colon
Kwasi
What is the skin
Astony Reply
What is physiology?
Njaleny Reply
it is the study of the structure of the human body and its reationship
Hannah
Physiology is the function of a living organism.
Tammy
It is the study of human body and how it works.
Excellent
It is d entrance to the uterus
Umunna Reply
It is a small sensitive part of female sex organ which is found above d entrance to the vagina
Umunna
A small hole in d skin which contains d root of a hair
Umunna
A thin membrane which covers d entrance to the vagina in young girls
Umunna
Is a gland that produces milk in women and other female mammals
Umunna
A repeated process in which a woman's uterus gets ready for pregnancy which ends in a period if she does not get pregnant
Umunna
hello
Tamba
hi sir
Mir
Hi
Umunna
so in summary describe the level of structural complexity within the body
Freda Reply
how can we describe briefly the levels of organization
Frimpong
what is blood clotting
Yahya Reply
Tiny bits in your blood called platelets get "turned on" by triggers released when a blood vessel is damaged. They stick to the walls in the area and each other, changing shape to form a plug that fills in the broken part to stop blood from leaking out. When activated, platelets also release chemic
Nilesh
what is a cell membrane?
lameck Reply
the cell membrane also called the plasma membrane regulates the transport materials entering and existing the cell.
Frimpong
what's gonna happen if your body doesn't produce enough white blood cells?
Jovanna
how is speech controlled by the nervous system?
Joseph Reply
The broca's area
Udebuana
what does the HCG
Njaleny
chemical level cellular level tissue level organ level organ system level organism
Chidera Reply
Yes Yes because they can perform more than one activity in the body
Chidera
the functional and structural unit of the body
Chidera
A group of 2 or more tissue that come together to perform a specific function
Chidera
A group of organs that work together to perform a specific function or meet the physiological needs of the body
Chidera
It's the highest level of organization
Chidera
2 or more cells coming together to perform a specific function
Chidera
Skeletal muscles can be tetanized but not cardiac muscle.Discuss
Okeke Reply
what is regional anatomy?
Grace Reply
study of structures that contribute to specific body region
charles
what is human anatomy?
Sam
It's the study of the interrelationships of body structures in a specific region
TM
is the study of the structure of the body and the relationship between body systems
Frimpong
it is the study of interrelationships of body structures in a specific region
christabel
this is the anatomy that deal with region's of body.
ONOJA
what is grey matter
OJO Reply
it is the major component of the central nervous system consisting of the neuronal cell bodies,neuropil,glial cells,capillaries and synapses
Frimpong

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Source:  OpenStax, Anatomy & Physiology. OpenStax CNX. Feb 04, 2016 Download for free at http://legacy.cnx.org/content/col11496/1.8
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